For many, growing cannabis in a greenhouse is simpler than creating an indoor grow room. Greenhouse growers find it easier than growing cannabis outdoors. Want to grow cannabis from seeds? Read on for everything you need! Includes info on your genetics, lights, nutrients, grow tents, soil media, and more! It’s possible to grow marijuana at home, both indoors and outdoors. However, there are many things you need to know before buying your first cannabis seeds.
Growing cannabis in a greenhouse
The recent explosion in ‘growing your own’ cannabis includes the rapidly growing community of greenhouse growers. For many people, growing cannabis seeds in a greenhouse is simpler than creating an indoor grow room. Greenhouse growers find it easier than growing cannabis seeds outdoors.
Greenhouses offer protection from the elements, insect predators and grazing animals. Greenhouses also provide a longer growing season. You can plant your cannabis seeds a little earlier than if you were growing outdoors. The greenhouse also protects your plants form the worst of the autumn weather during harvest, allowing you a greater chance of a safe harvest.
The many benefits of growing cannabis seeds in a greenhouse allows growers in northern European regions the ability to grow high quality cannabis with either feminised seeds or autoflower seeds.
Cannabis seeds and greenhouses
Greenhouses can be heated if required. This allows you to optimise the greenhouse environment even if you have unexpected frosts or stormy weather. It also allows you to germinate your cannabis seeds earlier than you might do for an outdoor grow. Read all about how to germinate your seeds in our germination guide.
With a little bit of thought and planning, growing cannabis seeds in a greenhouse can be a safe, secure and pleasurable way for the home-grower to be self sufficient in recreational or medical cannabis. Greenhouse-grown cannabis is incredibly potent when grown from good cannabis seeds. It’s no surprise that more people than ever are growing in greenhouses and enjoying the benefits.
Autoflower seeds in greenhouses
Many greenhouse growers enjoy large harvests of over 100g (dried buds) from each autoflower plant. The protective environment of a greenhouse protects the autoflower plants from the worst of the weather and the extreme low temperatures which can occur especially in early spring and autumn.
Autoflower seeds usually grow from seed to harvest in around 100 days in a greenhouse. Compared to feminized cannabis seeds that is a short life cycle. The short life cycle of an autoflower means it is extra important to optimise growing conditions and environment in order to maximise harvest quality and quantity.
A greenhouse protects your plants from high winds, damaging rain and low temperatures. Insects and pests can be easier to deal with in a greenhouse and less of a nuisance. All these factors are reasons why greenhouses are a great asset for the cannabis grower.
Feminised cannabis seeds and greenhouses
Feminized seed varieties grow very well in greenhouses. Often, they will grow vegatively until they sense the shortening days, and will start to show first signs of bloom around August, depending on your variety. In the northern hemisphere feminized seeds are often grown from around April to October in a greenhouse.
In a heated greenhouse the seeds can be germinated and planted around March/April, depending on your local weather conditions. This allows an earlier start than is usually possible outdoors. That’s because the greenhouse offers extra protection from the worst of the early season weather.
As a result, a greenhouse allows you to grow larger plants which can start earlier and finish later than would be possible growing outdoors without a greenhouse. Many growers of photoperiod feminized seeds routinely harvest several hundred grams, or more, of dried buds from a single plant. Plants can easily reach 2-3 metres tall and just as wide. A greenhouse also protects your plants from the autumn/winter storms. This can allow the greenhouse grower to grow a broader range of later blooming cannabis seeds than is possible outdoors.
Greenhouse cultivation of cannabis seeds. Using pots vs planting directly into the ground
Greenhouse growers are split into two main groups; those that grow their cannabis plants in plant pots and those that grow them directly in the ground. Plant pots can be easily moved if they need to be, for example if visitors, extreme weather or other problems are present. But plant pots will need more frequent watering and occasional feeds. A large cannabis plant in a 10 litre container will need watering daily during very hot weather. That could be a problem if you are away and unable to visit your plants.
On the other hand you may experience less issues with humidity, especially if your greenhouse floor is covered with paving slabs. Growing in containers also allows the grower more control over nutrient addition.
Some greenhouse growers even feed their greenhouse cannabis with automatic systems (e.g. AutoPot, Blumat, dripper systems or similar). It’s possible to grow cannabis in soil, coco fibre or any other grow medium in a greenhouse.
Plants that are rooted directly in the ground obviously can’t be moved, but will survive well even when you are away for a week or two. There is less need to worry about daily watering. If your greenhouse contains good quality moist soil then your cannabis plants will establish an extensive root network which will support a large plant with heavy yield potential. However, if the ground under the greenhouse contains poor quality soil then remove it and replace with good quality soil before growing plants in it. Serious greenhouse growers will dig in plenty of manure and compost at the end of each growing season to ensure optimized soil quality for the following years crop. One advantage of rooting your plant directly into the ground is that you can grow very large plants with unrestricted root space. It’s one way to get XXL harvests. Some greenhouse growers, when using the best cannabis seeds, find that a single plant can occupy the entire greenhouse and occasionally even run out of space. If this happens you can try low stress training to tie down the taller branches. In extreme situations, some growers have even had to remove some roof panels from their greenhouse if the plant grows uncontrollably. Plants which are rooted directly into the ground can be grown using automated feeding systems such as dripper systems etc.
Greenhouse overheating. Protecting your plants from extreme summer heat
One problem with greenhouse growing is that the temperatures can get very hot in sunny mid-summer weather. High temperatures make it difficult for the plant to grow. Leaves may wilt and the roots can find it difficult to provide sufficient water. This can be a serious problem, especially in a heatwave when temperatures inside the greenhouse can be in excess of 30ºC or even 40ºC. At these temperatures the cannabis plant struggles since conditions are so far from optimum. But the determined greenhouse grower can find ways around these challenges.
Greenhouses can be fitted with windows which open in hot weather and close automatically when it cools down again. These allow the hot air to escape quickly. An open door in your greenhouse can allow a cooling breeze to flow through. Greenhouse doors made with panels of fine wire mesh keep insects out but allow air to flow through.
Sophisticated greenhouse growers have watering systems in place to simplify and even automate water delivery. If the greenhouse is not in an entirely private location then it might benefit from a coat of white shading paint. This is sold in garden centres and used to protect greenhouses from overheating on the hottest summer days. For the cannabis grower this shading paint also stops people seeing what is inside your greenhouse, but green plastic plant mesh and tomato plants have also provided excellent cover for many generations of greenhouse growers.
Anyone that has been in a greenhouse on an early spring day will note how quickly they warm up in sunshine. This allows growers to get their preferred cannabis seed varieties started earlier in the season than they could outdoors. This allows the growing season in a greenhouse to start earlier. Your greenhouse will therefore benefit from larger plants and subsequently superior harvests. Cold nights can be mitigated with the use of greenhouse heaters that are available to purchase at any garden centre.
Just as with outdoor grown cannabis, the shift towards shorter days during the summer is a signal to the cannabis plant to start flowering and produce the desired female buds.
How do I get rid of excessive greenhouse humidity?
If you have ever seen your greenhouse windows dripping with condensation then you need to give some attention to reducing greenhouse humidity. Excess humidity creates an unhealthy growing environment for your plants and can encourage bud rot and mildew. Wet greenhouse glass panels will soak any leaves, branches or buds that press against the glass. If you want to ensure optimized plant health then consider some ways to make sure humidity doesn’t damage your plants.
Ensuring air movement and regular air changes in your greenhouse is important. Some of the techniques used to keep your greenhouse cool will also reduce humidity. Having adjustable roof vents which can open to release humid air is a great help. Having a through-draft thanks to an open greenhouse door is also a good idea.
Many greenhouse cannabis growers have fans in their greenhouse to move air around, and even to push air out of a door or open roof vent. This may mean fitting an outdoor, weather proof electricity connection to your greenhouse. But its a small price to pay for improved cannabis quality. A fan will also strengthen the stems of your cannabis plant by mimicking the effects of an outdoor breeze.
Some people copy the large legal greenhouse growers in the USA and fit an extraction fan to pump humid stale air out of the greenhouse. This can be combined with a carbon filter to remove any cannabis aroma from the exhausted air.
How large do cannabis plants get inside a greenhouse?
If the greenhouse grower can get good soil for his plants and (most importantly of all) start with good cannabis seed genetics then the plants can grow into true monsters by the end of the grow season. The greenhouse grower can see cannabis plants reach sizes rarely seen indoors. Many greenhouse growers have grown single plants that have filled small greenhouses and produced several hundred grams of top quality weed per plant. Good quality cannabis seeds may cost more but they deliver far superior results in the long run.
As previously mentioned, some greenhouses have windows that can be opened to let any monster plants grow out. But a safer option is to use cord to try to ‘tie down’ the plants if they do start growing massively. The photos above show what can happen when a prolific strain starts to turn into a large bush that wants to grow as high as a small tree. The plant simply becomes too tall for the greenhouse. The soil conditions, temperatures and good care resulted in a plant that was thriving as if in the jungle rather than a garden in northern Europe.
Of course this type of extravagant growth rarely occurs when cheap cannabis seeds are grown in poor quality conditions with badly prepared soil. Growing a monster plant requires properly dug, well prepared nutritious soil at the start of the season. The pictures show large cannabis plants simply outgrowing the greenhouse, delivering heavy harvests for the grower. The Dutch Passion Shaman variety was bred specifically for outdoor/greenhouse conditions. Shaman combines some incredibly potent skunk/purple skunk parents with vigorous growth. Shaman eventually grew into a bush 3 metres tall and two meters wide, winning the Dutch Passion photo contest award in 2006. In this case the grower was forced to remove a pane of glass from the greenhouse as his resin soaked Shaman outgrew the tall greenhouse. The plant was too strong to be tied down, and security was not a problem on this particular grow so the grower went on to harvest an abundance of top quality greenhouse grown cannabis, despite the obvious size problems of the Shaman.
Cannabis genetics and greenhouse growing
When growing with good cannabis seeds in a greenhouse remember that some plants will grow as wide as they are tall especially if they have plenty of sun, good soil and ample root space. Remember too that a few seeds could provide a years worth of medication or recreational weed, so regard the cannabis seed as an investment and get a good variety. Cannabis seeds are one area of your life where you really don’t need to compromise. Look at the Dutch Passion website for some cannabis cup winning options. Proven varieties for greenhouse growing, especially at northern latitudes, includes Shaman, Durban Poison, Passion #1, Frisian Dew and Frisian Duck. These varieties have been used by numerous repeat growers over many years. They have passed stringent standards for potency, quality, pest/mold resistance and vigour. Growing these feminized seeds in a greenhouse will deliver excellent results.
Early flowering using a ‘darkening system or extending your growing season
Some growers equip their greenhouses with a ‘darkening’ system. Essentially this involves using dark blinds/curtains to create blackout conditions inside even when it is sunny outside. This can be used to simulate short summer days and ‘force’ the plants to start flowering and producing buds much sooner than normal. Although this involves extra expense it is one way of accelerating greenhouse weed production. The grower simply uses the blinds to reduce daily light exposure to 12 hours (or less) and the plants in the greenhouse respond by flowering.
Greenhouses also have the benefit of allowing the grower to extend the end of the growing season. Cold sunny autumn days on the outside become warm and comfortable in a greenhouse and allow plants to ripen properly. Pests are normally easy to control in a greenhouse, and so long as the greenhouse is secure it is a great and simple way of growing.
Many also grow cannabis seeds in polytunnels these days, the benefits of the poly tunnels being much the same as greenhouses. Polytunnels protect against the worst of the elements, keeping the plants safe and giving a long growing season. Polytunnels come in a wide range of sizes and they also offer privacy to the grower.
Greenhouse growing of cannabis has lower ongoing costs compared to indoor growing, where large amounts of cash are spent on grow lights and ongoing electricity use. By contrast, growing cannabis in a greenhouse only requires a seed and some substrate to grow in. The sun provides free energy for your plants to grow.
Greenhouse grown cannabis versus outdoor cannabis
Many outdoor cannabis growers eventually upgrade to greenhouse growing. The greenhouse allows more potent crops, higher THC levels and a better terpene profile due to the protection offered by a greenhouse. Whether you are growing with a large commercial budget, or a small greenhouse with just one or two plants, the quality improvements are always important and appreciated. Because greenhouse grown cannabis plants grow in a more sheltered environment the plants are healthier, enjoying more optimized conditions. The plants can grow without damage from extreme cold, storm/hail damage and wind damage. Pests and disease are easy to prevent and deal with in a greenhouse. A greenhouse protects your plants from the worst of the weather, hail and torrential rain. Greenhouses protect your plants from cold weather, creating a warmer environment where your buds can ripen and mature under conditions which are often far superior to outdoor weather.
Growing cannabis seeds in a greenhouse with artificial lighting
Even in warm climates, many greenhouse growers supplement the natural light with additional light on cloudy days. These days LED grow lights can be used to provide additional illumination which can be automatically switched on when ambient daylight (PPFD) levels drop too low. Growers in cool climates, such as Scandinavia may prefer to use supplemental HPS lighting which offers both light and heat to the plants. Supplemental lights also allow you to extend the natural sunlight hours. This would allow you to grow autoflower seeds in a greenhouse and have 18-20 hours of daily light. Artificial light would be used to give the autoflower plants their preferred 20 hours of daily light with optimized yields and quality.
The experienced grower can use the benefits of a greenhouse to grow larger plants, with improved quality and a longer life cycle. Plants can be started earlier and harvested later thanks to the extra protection offered by the greenhouse. During the cultivation process the conditions inside a greenhouse are better than those outside, promoting improved plant health, superior yields and better potency. Outdoor grown plants, without these benefits, usually offer lower yields and quality.
Where to locate your greenhouse?
If you get a greenhouse it pays to think carefully about the location. When it comes to security, always think about a location which makes it difficult for neighbours or the public to see/smell your crop. Also consider your local climate. If you are living in a cool climate it pays to locate the greenhouse where it will receive maximum sunlight for as much of the day as possible. If you live in a hot, desert climate you may want to consider locating the greenhouse under some trees which will shade the greenhouse during the hottest hours of the day in mid-summer. Mediterranean greenhouse growers may wish to place their greenhouse in a cooler, northern part of the garden where some shade may be present. Remember that when temperatures reach 40-45ºC the temperatures become damaging.
Many greenhouse growers also arrange a hosepipe/water connection near their greenhouse. This simplifies the process of getting water to your plants. The last thing you need on a hot day is numerous long walks from your house to the greenhouse with a watering can.
Greenhouse options for cannabis growers
Greenhouses are available in a wide range of sizes and budgets. The lowest cost ones use a flexible transparent plastic mesh sheet which fits over a small plastic/metal pole frame. These can cost as little as €20 but can only fit a single plant inside. Some greenhouses are designed to be leant against an outside wall of the house. Heat from the house helps keep the greenhouse warm. Greenhouses are also available for people that live in an apartment and have a small balcony. Polycarbonate greenhouses use toughened ‘unbreakable’ transparent plastic panels instead of glass, these are useful if you are worried about safety or have small children. Whatever your budget and space, somewhere there is a greenhouse for you.
Growing cannabis in a greenhouse. Easy and effective cannabis growing
Growing cannabis in a greenhouse is a simple and cost effective way to be self sufficient in your cannabis needs. Greenhouse growing seems to be a rapidly expanding pastime amongst cannabis growers of all backgrounds in a wide range of countries.
The more professional greenhouse grower will take care to introduce new, good quality soil/fertilizer each year and keep the greenhouse clean and tidy to minimise potential for pests and disease. Some greenhouse growers use strategically placed fencing and shrubs to make the greenhouse inaccessible to unwanted visitors and invisible to prying eyes. Greenhouses are cheap to buy. You can buy small low cost plastic ones for not much more than a hundred euros. Even cheaper ones are available with plastic covers. They are available everywhere and come in any shape/size required for all budgets. Some of the modern polycarbonate greenhouses are also opaque giving instant privacy and have lockable doors. What more could you need in your back garden? Remember that poor quality cannabis seeds can’t produce connoisseur quality cannabis, no matter how well you grow them. Invest in the best cannabis seeds you can get from a company with a proven reputation, and enjoying growing your own cannabis in a greenhouse.
30 Comments . Leave new
Thanks for the wisdom Dutch Passion, trying to prevail over the bad weather now in UK with some of your Frisian Dew. Closed up my greenhouse letting a good air supply breeze through some openings and one hole at the top for rain water to drip down. Wish me luck !
We always hope for one of those late summer periods during the end of flowering, but we’re not always that lucky.
But Frisian Dew should be able to handle some harsh conditions. So we hope you still end up with some great results! Good luck!
Nice info!! I clear my doubt here. Keep sharing such info with guys. And also get more information about cannabis here, https://420expertadviser.com/grow-lights/mars-hydro-600w-review/
Hi there Dutch passion, what is the best feed to put into your plant? Cherrs
We advice biotabs for your plants, super easy organic nutrients which will make your babies happy!
Hi, for a reason I have to move my indoor Plants almost 2 weeks at the end of the flowering period (12h ) outside where they get 11 hours direct sunlight..is it safe? are they gonna go back on vegetative grow again?
Thanks for your advice
This will surely bring some stress to your plants. When you move them outside do they get more than 12 hours of sunlight (not direct but in total)?
Because if they go to an environment where they will have longer days they will go in to vegetative state again and you do not want this if your plant is finishing up flowering.
I am new at this. My plant has reached the top of my outdoor greenhouse. It is still in veg. stage Would it stress the plant if I remove the greenhouse? I has two doors that are open, so the plant has been getting a lot of direct sunlight.
If the temperatures are not too low outside without a greenhouse this should be no problem and should not give a lot of stress to your plant.
How many plants autoflowering per square
meter I can put in greenhouse ?
We advice around 4 autoflowers per square meters so they have enough room to grow big
help ! I am at week 12 of auto flowers in a GH – but I think the grow has stalled ? super early signs of buds for the last 3 weeks but then nothing ? Started in June. Super bushy and good looking but no bud growth ? Any ideas ? should I start with some bloom nutes ?
After 12 weeks you should definately have some bud production. If you want you can send us over some pictures so we can assist you better. Please send them to [email protected] with some information about your grow.
My plants are pushed up against the glass after two prunes will this effect the plants when they flower?
If the buds are against the glass you have a high chance of bud rot because there is not enough air flow through the buds.
Will my plants still ripen in a opaque green house. Do I need a light in there. They are about 2 weeks from Harvest. But, we are getting down to 12 to 22 degrees Fahrenheit at night
If you could give them some supplemental lighting that would be great. Your plants will have a hard time with these temperatures and with some extra light you can make it a successful harvest
Is it possible to grow cannibis in a green house using a tinted plastic material or polycarbonate that isn’t crystal clear?
It should be possible, but sunlight is very important for your plants. Sufficient light penetration should be possible with your plastic material. Do you know if other plants grow under this material?
I have just received my californian orange seeds thankyou for your fast delivery I have ordered a plastic greenhouse and will be using pots do I germinate them inside my house first ? My garden gets very hot with sun from 9am to 7pm in summer
It is indeed best to germinate them in your house because there the seeds will have a stable environment and temperature.
In the first stage after the seedlings germinate you should be careful with direct sunlight because it can damage them.
Hello, i have Auto Think Different in greenhouse in pot, but i dont know if direct sunlight avaible if better to stay in greenhouse or take pot to direct sunlight as much possible sometimes we have there also 30C, what do you think?Im from Czech Republic.thx for answer and sorry for bad english.
If your pots are mobile, I advice you to move them out of the Greenhouse and in to the sunlight when you have extremely hot temperatures.
If the temperature is around 20/25 degrees Celsius you can leave them in your greenhouse as long as you ventilate enough
Hello friends I live in a country where the use of marijuana is against the law. I intend to plant a greenhouse. Thank you for teaching me zero to one hundred planting jobs.
I have started plants in a tent 18/6 lighting in Feb have taken out of Tent and put on dressing table before putting them in greenhouse, will they survive?
To give a good answer we would need some extra information like the conditions that you have for your plant on the dressing table. Could you please send us an email at [email protected] with some explanation and perhaps some pictures? Than we can help you from there.
At what stage should plants be moved during the day time from window sill to either greenhouse or garden? (In southern England where it is pretty warm now). I have the option of both garden or greenhouse
Around 2 weeks after your seedlings have come out of the ground you can put them outside. Be careful in the beginning with too much direct sunlight, the seedlings cannot handle too much in the beginning. At the very start you can also take them inside at nighttime to protect them even more.
Should I use shade cloth over my greenhouse in the hot summer days?
Ventilation is really important in a hot greenhouse, if it really gets too hot you can use a shade cloth as well
How to Grow Cannabis from Seeds in 7 Steps: The Ultimate Guide to Your Best Cannabis Grow – 2020
Growing cannabis from seeds is easier than you might think. Read on for info on genetics, soil & other grow media, grow tents, lights, nutrients and more!
Before we begin, I’ll be straight with you: All you really need to grow cannabis from seeds is a pot, grow media like soil or coco, seeds, water, plenty of light, and a few nutrients. That’s it. Of course there are other supplies you could use such as a grow tent or high performance LED light, but they’re not always necessary. Cannabis has a long history of wild growth without any help from people. There’s a reason they call it “weed,” and that’s because it grows like one.
But even though you can grow cannabis without any special equipment, there’s an advantage to spending a little money on the right equipment. Industry experts are constantly improving their products which in turn help produce higher cannabis yields and a better flower. So today, as part of our mission to educate and provide valuable information, we’re going to go through each stage of your cannabis grow and highlight some of the equipment that can help you maximize your harvest.
Do you want to learn how to grow cannabis? Check out Growers Network University!
1. Cannabis Genetics
Genetics is just a fancy word for your seeds, and that’s what you need if you want to grow cannabis from seeds! The term can also refer to cannabis clones, but for the beginning grower, seeds are much easier to source. If you are interested in starting from clone stock, you can generally purchase them from a qualified local grower, assuming there are no laws against clone sales in your jurisdiction.
But which Cannabis seeds to buy? That depends on your grow style and personal preference. You’re going to choose an Indica, Sativa, or hybrid or course, but do you want regular seeds, feminized seeds, autoflowering seeds, or some combination? With regular seeds you’ll have to remove any males before they mature and pollinate your females or you’ll end up with seedy, low-quality buds. Additionally, cannabis grown from regular seeds will only flower in response to a change in the photoperiod (how many hours of light they are exposed to) so farming these types of seeds requires a bit more care and attention than autoflowering strains (which produce buds when they are old enough, not in response to the light) or feminized seeds which eliminate the need to monitor for males. If you’re looking for the simplest type of seed, you can go with autoflowering, feminized seeds.
Note: See our cannabis seed FAQ section below the article.
2. Cannabis Germination
Germinating refers to sprouting your cannabis seeds prior to planting. This isn’t always necessary when growing cannabis from seeds, but it WILL improve your chances of germination. The easiest way to do this is to fold your seeds inside of a moist paper towel and wait for a few days, making sure your paper towel remains moist. In this time you should see your seed “pop” as the tap root emerges. Now you’re ready for planting.
If you want a more controlled germination of your cannabis seeds, there are mini-greenhouses available with starter pods which allow your seeds to begin rooting prior to transplanting them into your grow media and offers an overall safer transition from germination to pot.
You can have a look at germination domes here.
3. Grow Media, Grow Tents, & containers
More than likely, you’ll be growing indoors in a grow tent and in soil. There are a variety of media types available including soil, peet, and coco. We recommend soil for the beginner, but whichever you choose it’s important not to skimp on the media. Spending a little extra money on your media will pay off in terms of cannabis quality and help you avoid problems such as pests, unbalanced pH, and poor nutrient delivery. You can see a few recommended soil and other media products here.
You’ll probably also need a pot. The pot you choose should be at least one-gallon and allow excess water to drain off. Once you’ve added the media to your pot and have your seeds, you’re ready to plant. Just insert your finger into the soil to create a ½ inch to 1 inch divot and place your popped seed inside. Cover and water appropriately. We recommend fabric pots which are reusable, lightweight, and drain very well.
The last thing to consider when planting your germinated seeds is where are you going to grow them? Are you growing in a closet? Do you have a dedicated space somewhere in your home? If not, a grow tent is an excellent option for creating a highly controlled growing environment. Grow tents are easy to assemble and their reflective interior maximize light efficiency. There are even kits that will provide everything you need including a fan to generate necessary air flow and a filter that will help keep the smell of your plants from wafting from your grow tent into your personal space. Even if you don’t mind the smell, your neighbors might! You can check out this grow tent configurator which will guide you through the best grow tent set up depending on the space you have available and the number of plants you plant to grow. You can check out our recommended soil media here. Need a pot? Check these out.
4. Cannabis Grow Lights and the Vegetative Phase
The vegetative stage is where your plants bulk up and develop the frame necessary to support the eventual flowers. As mentioned in the genetics portion of this guide, your seed choice will influence the amount of care and attention you’ll need to provide. If you choose regular seeds, the vegetative stage of cannabis growth will require an 18-6 light cycle (18 hours on and 6 hours off). The size of your grow will determine your light requirements and there are many choices. I tend to recommend LED lighting because they’re energy efficient and produce less heat than other types of grow lights, which will help keep overall temperatures down in your grow. Check out a few LED recommendations for your cannabis grow here. Keep in mind the size of the light if you’re using a grow tent to assure it will fit.
Fluence is a great LED brand, but far from your only option.
The vegetative phase is also where you begin monitoring the sex of your plants and then remove and destroy the males as soon as you identify them. If you have access to female clones, this step isn’t necessary, but it will be if you grow cannabis from seeds. You can check out our guide to sexing your plants here. Again, this is a step you need to take when growing from regular seeds. If you use feminized seeds you can be nearly 100% certain that all of your plants are female (1 in 1000 feminized seeds may turn out male).
Since the vegetative stage of growth is where your plant will bulk up and develop its framework, you’ll want to make sure you use some quality nutrients to ensure your cannabis grows strong and healthy. Click here for our recommendations.
A nutrient bundle is a great way to save money
Last but not least, an important consideration during the vegetative stage is pest control. It’s important that you monitor for pests and diseases during the duration of your grow to deal with any problems before they reach crisis level and threaten your crop. Fortunately, close monitoring and cleanliness will help you avoid most of these problems, but should you encounter pests or disease, there are a number of great, organic products that can take care of nearly any problem. And don’t worry, we recommend only products suitable for treating consumable plants. Check them out here.
5. Flowering & Nutrients
The flowering stage is when your cannabis plants will develop their buds. Again, if you choose to grow from “regular” seeds, you’ll change up the light cycle from the 18-6 you used in veg to a 12-12 cycle (12 hours on and 12 hours off up until harvest); autoflowering varieties won’t require this change as again, they flower when they are mature enough.
During this stage you are going to want to continue monitoring for pests and also add a “bloom formula” nutrients to help make big healthy buds. See our recommendations for your cannabis grow here.
6. Cannabis Harvest
A week or so before harvest you’re going to want to “flush” your media. This simply means that you stop feeding your plant nutrients and give only water. This allows your cannabis to use up all the available nutrients remaining in the soil so they won’t end up in your buds. Also, you can expect a degree of leaf yellowing during this final week as your plant converts its available resources into energy for continued bud development.
You can see our full article on when to harvest your buds here, but generally, you can determine when your buds are ready for harvest by examining the trichomes. You can use microscope to get a close up look at the trichomes. Clear trichomes generally mean it’s too early to harvest and your buds won’t be as potent. Milky white-amber trichomes means you are ready to harvest and can expect decent buds. If you wait longer, until the trichomes are completely amber in color, you’ll get a stronger psychoactive effect as CBD levels decline.
Harvesting generally requires scissors or gardening shears to remove your colas (bud sites) from your cannabis plants. Be gentle as to not disturb the potent trichomes.
7. Drying and Curing
Before we go into drying and curing, we should quickly revisit trimming. Trimming can be done before drying (wet trimming) or after drying (dry trimming). Either method is fine and will depend on your preference. The goal when trimming isn’t only to make your buds pretty by removing any fan leaves (which it definitely does) but also to collect the “sugar leaves” that surround your buds. Don’t get rid of these sugar leaves. They’re great for extracts, hash making, and in a pinch you can even smoke them, though smoking them will be a bit harsh.
With proper temperature and humidity control, you’ll be able to dry your cannabis in the same space you grew it. Most growers I’ve spoken with dry for a minimum of one week and often up to 10-14 days. There are a number of drying racks available that will allow you to spread out your buds for even drying. If you choose to dry trim, you’ll do this after drying but before curing.
Curing is a specialized drying process that comes after the initial drying and trimming. The goal is to cure the buds much like you would with homegrown herbs. You want a dark space with low humidity. You can cure in a glass jar, plastic tub, or a specially designed c-vault. You’re going to want to “burp” your container daily to remove any moisture remaining in your buds, and this is accomplished by simply opening the container and closing it again. The curing process can last anywhere from a few days to a couple weeks. Check out a few helpful products here.
A hanging mesh drying rack is only one option for your drying needs.
The CVault is designed to provide complete darkness and airtight bud curing.
So are you ready to grow cannabis from seeds? Hopefully we provided some good tips for media, lighting, and grow tents to get you started. We’d love to hear from you regarding your grow so please leave a comment in the survey below or click one of the “Join Now” buttons at the top and bottom of this article to get into our private, vetted, professional forum. And don’t forget to check out Growers Network University! See you there and happy growing!
A few questions about mail order cannabis seeds
Where can I buy cannabis seeds safely?
There are a number of good seed vendors out there. Our recommendations are established companies with great customer reviews so you know you’re purchasing quality cannabis seeds.
Is it safe to order cannabis seeds through the mail?
People always wonder about the legal risk of purchasing cannabis seeds through the mail. Legitimate seed vendors (including those we recommend) ship discreetly to most locations. Seeds can be stopped by customs, but this doesn’t happen often. You also want to make sure that wherever you decide to purchase your seeds will also ship to your country. This information should be transparent and available on the vendor’s website.
Before You Purchase
Questions you should ask before purchasing Cannabis seeds online
- Do you recognize the name of the cannabis seed company name? Branding goes a long way and a recognized, established brand is something to consider when purchasing Cannabis seeds online.
- What are customers saying in their reviews? Did they receive their seeds? Were they high quality?
Researching these questions will increase your chances of being happy with your Cannabis seed purchase.
- Do you know anybody who has used them as their Cannabis seed supplier?
Word of mouth recommendations are very powerful in the cannabis community. Someone else’s first hand experience can be helpful if you aren’t sure about which brand of Cannabis seeds to purchase.
- What’s their return or refund policy?
A good seed shop should at least have generally positive reviews and a well-defined refund or exchange policy.
Beware of cannabis Seed Scams
If you’re contacted via social media to purchase seeds, chances are you’ve been targeted for a scam. We recommend using established cannabis seed vendors such as those linked above.
How To Grow Marijuana From Seed
Article written by
Tina Magrabi Senior Content Writer
Tina Magrabi is a writer and editor specializing in holistic health. She has written hundreds of articles for Weedmaps where she spearheaded the Ailments series on cannabis medicine. In addition, she has written extensively for the women’s health blog, SafeBirthProject, as well as print publications including Destinations Magazine and Vero’s Voice. Tina is a Yale University alumna and certified yoga instructor with a passion for the outdoors.
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