- Weedguru Higher
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- Joined: Sun Mar 30, 2003 1:31 pm
- Location: Canada
Although natural sunlight is the best form of light for growing cannabis plants, their life cycle can be controlled more effectively with artificial lighting
The life cycle of the cannabis plant is determined by the daily photoperiod (hours of light per day).
Although the lamps should be kept as close as possible to the growing leaves, they should never be allowed to touch the cannabis plants.
The best light for cannabis plant growth during the vegetative cycle emits high intensities of the blue and red bands of the light spectrum.
Fluorescent light is an effective source of artificial light readily available to home growers.
The amount of light you supply your cannabis plants depends on the size of the garden, but at least 20 watts per square foot is recommended.
Although Metal Halide lamps are generally considered a better light source for marijuana growth, they use a lot more electricity than fluorescents..
Under artificial light, a cannabis plant can grow from three to six feet tall in three to four months.
Cannabis plants entering the vegetative stage enjoy up to 24 hours of light per day, while twelve hours or less is required for flowering.
The more light you give your cannabis plants, the faster they will grow.
Lamps should be fixed to the ceiling in such a way that they can easily be raised as the cannabis plant grows in height.
The use of reflectors ensures that the light is spread more uniformly around the cannabis plants.
Use a fan and exhaust system to cool down your cannabis plants if the lights in a small grow room raise the temperature too much.
Cannabis plants grown in conditions of varying daily light patterns will not settle into a regular life cycle and will grow poorly.
If there is insufficient light in the grow room, the cannabis plants will often grow tall and thin, in search of the light.
Do not "wake up" your cannabis plants by switching on the lights if they are in the dark period of their daily light cycle.
Cannabis plants grown with a long daily photoperiod, will require more frequent watering than those grown with less light.
If the edges of the leaves near the lights and growing tips start curling up, it usually means that they are getting too hot.
A cannabis plant will grow with as little as six hours of light per day, but requires more than twelve hours per day for good strong growth.
Use a highly reflective material like mylar or white paint on the walls, floor and ceiling of your grow room white for better reflection of light onto your growing cannabis plants.
If you have a few cannabis plants growing unevenly under one light, you could raise the pots of the smallest cannabis plants by placing them on a few bricks.
Although easy to control, the daily light photoperiod is the single most important factor influencing the growth of your cannabis plants.
Cannabis plants require less than twelve hours of light per day for at least two weeks before you can expect to see the first signs of flowers appearing.
Never increase the daily light photoperiod to more than twelve hours, once your cannabis plants have started flowering.
A cannabis plant grown indoors with lots of light will often grow larger and more potent than a similar cannabis plant growing outdoors in natural light.
To increase the amount of light available to the lower branches, you could mount extra fluorescent tubes vertically, onto the walls of your grow room.
If your grow has a window, cover it with foil or something to help keep light out and in. You don’t want people knowing your growing. It also keeps outside light from disturbing your plants photo-period cycle.
A good way to check to see if the lights are too hot for your plants is to put your hand between the light and the plant with the back of your hand toward the light, if your hand is getting too hot then it is probably too hot for the plant.
When choosing lights, it is good to get some in each spectrum of light. Some in the blue spectrum, some in the red spectrum.
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