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best light hours for growing weed

Best light hours for growing weed

This is done by changing the plant's light schedule to 12-12, where the weed plants gets 12 hours of light a day and 12 hours of total darkness.

So all strains of cannabis that respond to light in this way (where the light period effects what stage they're in) are called "Photoperiod dependent" strains.

Check out my cannabis grow light guide for more info about picking out suitable lights!

For an indoor grower, when a plant is about half the final size you want it to be, you should change it over to the "Flowering" stage. This is the stage when your plant starts growing buds.

You do this by changing your light so that it only shines for 12 hours a day, and the other 12 hours a day your marijuana plants are kept in TOTAL darkness.

When growing marijuana outdoors, a grower doesn't need to do anything to induce flowering because the sun will take care of things on its own. It's just important to make sure that there are no lights shining on your plants during their night period (which will disrupt their dark cyle).

I tend to set my timer to shine line from 8pm-8am. This gives me time to check on my plants at night when the lights first come on, and I can also check them quickly in the morning before I go to work. It also keeps things cooler since the lights go on at night.

After 2-3 weeks of the 12-12 light schedule, most cannabis plants will show the first signs of their gender (they either are a female plant which starts growing buds, YAY! or they are a male plant which start growing balls/pollen sacs, NO!).

Best light hours for growing weed

It can take anywhere from 4 to 8 months to grow a cannabis plant, this varies based on where you’re growing. If you have an indoor grow room, your plant has the ability to flower after only a few weeks!

1. Germinating Seeds

Male: Small green sacs full of pollen will be seen on the node areas.

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Cannabis growth is made up of a series of stages that plants undergo during their lifecycle. Each stage during the cannabis cultivation process requires its own unique demands, including different levels of light, water, and nutrients.

Best light hours for growing weed

By turning off the lights for two hours at a time throughout the day, your cooling system will get a break between light cycles, allowing the room to be cooled to desired temperatures before the lights come back on. With a properly sized cooling system, this benefit will be minimized as the system will be designed to handle the heat load throughout the entire light cycle.

The key factor in growing cannabis is not the light periods; it’s the dark periods. Stephen Keen weighs in with his preferred light schedule for growing big, productive plants.

At a biological level, cannabis’s inability to grow more once it has received a certain amount of light can be attributed to the way the plant processes carbon dioxide (CO2). A majority of the mass accumulated in cannabis is associated with the amount of CO2 found inside plant cells.

Giving plants six hours of intense light at a time not only puts less stress on the plants, it also spreads out the load on your cooling system over a longer period. The cooling system works the hardest when lights are on.

Benefits of a 6/2 Light Schedule

By turning off the lights for two hours at a time throughout the day, your cooling system will get a break between light cycles.

Cannabis is a short-day plant, meaning it will only flower when exposed to long periods of darkness and short periods of light.

While under light, cannabis tries to prevent CO2 from leaving its cells by cutting off transpiration. However, this prevents new CO2 from entering the cell, blocking new growth. When the lights are turned off and no photosynthesis is occurring, the plant can absorb new CO2 into its cells.

Additionally, when plants are exposed to 18 straight hours of intense light, they become stressed. Signs of stress, including droopy or curled leaves, will usually appear toward the end of the light cycle. While some stress can be beneficial to plant growth, too much stress can cause harm to your plants and prevent them from reaching maximum growth potential.

While this new schedule may sound risky, it actually comes with a number of benefits.