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growing cannabis in a greenhouse

Growing cannabis in a greenhouse

Cannabis plants in the flowering stage need higher light intensity and a different spectrum than seedlings that just germinated. With Oreon’s LED lights, you can set the perfect conditions to get just the right amount, light intensity and spectrum for the growth phase the plant is in. The ability to respond to these specific needs is a great advantage of growing medical cannabis in a greenhouse, in comparison to growing outdoors.

Our LED lights for cannabis indoor enable you to take your greenhouse growing system to the next level.

Manipulate the cannabis life cycle

The use of natural sunlight comes with disadvantages: you can’t control when and with what intensity the sun shines. With LED lights, you are in charge of the lighting hours and it empowers you to manipulate the life cycle of your plants. You’re not dependent on the season or the daylight hours the sun provides and you can keep a consistent optimum level of light during the day. With LED lights, you can recreate the temperature of summer during winter and extend the daylight hours in the autumn and the winter. This does not only improve the quality of the crop, it accelerates the growing process as well and can lead to an extra cycle per year.

Growing medical cannabis in a greenhouse provides the opportunity to benefit from the biggest advantage of growing cannabis outdoors: the warmth and light of the sun. At the same time, a greenhouse protects your plants from the disadvantages like poor weather conditions and vermin. One thing is for sure, successful cultivation of cannabis starts with high quality seeds. If you completed this first step, you can start growing any variety of cannabis in a greenhouse.

Growing cannabis in a greenhouse: it works!

Cannabis plants need warmth to grow, but it doesn’t like too much heat and the LED lights should be cooled to prevent overheating. LED grow lights with an active water cooling system can offer the solution. The heat the LED lights produce is taken away from the fixtures and stored separately. This prevents the heat from rising to the top of the greenhouse. This makes it unnecessary to vent once in a while, which means that no CO2 can escape. Plants need CO2 to grow, so there’s no need to add it again later.

First, let’s get some terminology issues out of the way. Greenhouses and high tunnels are similar but not exactly the same.

Many folks in northern latitudes start their seeds indoors in April under grow lights and transfer them to a greenhouse in May. Your own schedule will depend on your climate and growing season, of course.

Greenhouse vs. High Tunnel

You will want to be sure to give your cannabis plants adequate amounts of water and fertilizer to ensure steady, strong growth throughout the season. A drip irrigation system can supply these essentials reliably and economically. has an entire section on the best irrigation products to grow cannabis.

Growing Marijuana in a High Tunnel or Greenhouse

To help you get on your way, DripWorks is happy to provide you some basic tips on how to grow marijuana in a greenhouse or high tunnel.

Another common cannabis greenhouse mistake is over fertilizing, synonymous with over feeding. Compost and other organic matter is the ideal solution for fertilization, because the nutrients are released over time rather than as a single “meal” for the cannabis. Liquid non-organics are also an option. Regardless of which type of food you choose, be sure to follow the directions and scale up slowly, starting with a little less than the recommended amount. It’s easy to correct the mistake of not feeding your plants enough; the same can’t be said for over feeding.

It may be tempting to harvest as soon as you see the first opportunity. After all, you’re probably anxious for the cannabis to bear the fruit of your labor. Yet doing so is counterproductive and will lower your yield and the crop’s potency. There is no definitive or universal answer to the question, “When should I harvest?” It all depends on how potent you want your cannabis to be and the conditions in which it was grown. Generally, you want to see at least 50 percent curled or darkened pistils before harvesting – but again, this is far from a surefire guideline.

3. Bad Seeds

One of the easiest marijuana grow room mistakes to avoid is using shoddy materials for your greenhouse. At Americover, we produce high-quality agriculture and horticulture covers that help you yield brilliant results when paired with light deprivation. Click here to get pro light dep tips for cannabis cultivation, and then browse our greenhouse covers online. You can also email us at [email protected] or call 760-388-6294 to speak with one of our greenhouse material experts.

7. Premature Harvesting

Like with most other plants, there is a fine line between watering and overwatering cannabis. The latter can cause root rot, which is usually a death sentence for the plant, as drowned roots are nearly impossible to revive. You can tell whether your cannabis is adequately watered by feeling the topsoil with your finger. If it is moist to the touch, it’s not time to water yet. Wait until that top layer is bone dry. If you are unsure, it is better to wait until you see the early signs of under-watering – such as slight discoloration or wilting – than to continually waterlog the cannabis. As you start to get your growing down to a science, you can use measurements and a set schedule based on your observations.