Choosing a space to grow indoors is just as important as choosing the proper space outdoors. Your garden should be located in an out of the way place (not the bedroom). Basements, attics, and closets are all great places. Once you have a few possibilities in mind make sure the have access to electrical outlets. Plan ahead for anything that might require a repairman to visit your house.

If your garden is located in the same room as the furnace, and the furnace explodes, your in big trouble. Once the permanent garden location has been selected it is time to prepare it. (For the rest of this document I will assume you have chosen a close t as the grow space) Paint the walls flat white. Do not use tin foil because it can actually focus light like little laser beams and burn holes through the leaves. Next, cover the floor of the closet with plastic. This will help stop water damage to the floor.

Containers

Your plants will need to be grown in some kind of pot or container. Large plastic pots (like the ones bushes come in) work best. Fill the bottom inch with large gravel to help drainage. And the rest with high quality potting soil with some sand mixed in. Buckets can also be used but drill drainage holes in the bottom. If your containers previously held other plants then they must be sterilized with bleach or alcohol.

 

Lighting

Since there is no sun in your closet you will have to provide a sun loving plant like marijuana with allot of artificial light. There are three options available to the grower: fluorescent lights are cheap, efficient, and don't put out much heat. Metal halide, or MH bulbs, are more expensive but put out much more light than fluorescent. They also put out more heat so ventilation is needed. MH bulbs also require a separate ballst in order to work. High Pressure Sodium lamps, or HPS, put out as much light as MH lamps but with a little less heat. Ventilation and a separate ballast are also required.

	Fluorescent lights Fluorescent lights are the cheapest light to use. They run at about $2 a tube. They produce little heat so ventilation may not be needed unless the space is very small. The light spectrum put out by these lights is suitable for all stages of growing. Because fluorescent disperse light over a large area, they need to be kept within three inches of the tops for the plants to receive enough light. This means you will have to mount the lights in a way that the can be raised everyday.
	Metal Halide Lights Metal halide lamps put out the most light. They also produce allot of heat. A strong fan is needed to keep room temperatures down. MH lamps put out light mostly in the blue spectrum. Blue light is used best by the plant during vegetative growth. MH lights can also be used for flowering with no adverse effects. A separate ballast is required for these lights to work. They come in sizes from 40 to 1000W. One 1000W lamp will provide enough light in a closet to grow four plants.
	High Pressure Sodium Lights High pressure sodium lamps put out almost as much light as MH and with less heat. Good ventilation is still required though. HPS lamps produce light in mostly the red and orange end of the spectrum. The plants uses this light best when flowering. HPS lamps can also be used for vegetative growth with little slow down in foliage production. HPS lamps require a separate ballast for operation. Some growers switch between MH and HPS depending on what stage the plants are in. MH is used in vegetative growth and then the light is switched over to HPS once flowering begins. Most growers use fluorescent to start seedlings and root clones. The fluorescent are weaker than the MH and HPS lamps and therefore do not stress them too much. Choose whatever light is best suited for your situation. If your are growing in your attic go with MH or HPS. If your growing in the closet like us, then use fluorescent. (For the rest of this document I will assume the reader is using fluorescent lighting).

There are other factors other than the obvious amount of light that reaches the plants that affect the rate of photosynthesis. These can be manipulated by the grower to achieve maximum speed of growth and larger yields in a shorter period of time.

Humidity

The humidity in the environment is the amount of water vapor present in the air. Most growers know that humidity in excess of 85% percent increases the probability of the appearance of bud mold. The humidity is also critical during germination when the seedlings are extremely fragile. Humidity should be kept over 80% at this stage in the plants life to prevent the soil from drying too fast. Experimentation has shown that a relative humidity of 65% to 80% increases growth rate. Below this level the plants develop extremely narrow and tissue paper thin leaves to try to prevent excess loss of water. Above 80% relative humidity the plant have trouble disposing of toxic chemicals through evaporation.

Temperature

Marijuana can survive temperatures from 32 degrees F to over 100 degrees F. Cannabis will grow best with a temperature of 70 to 75 degrees F day and night. Higher than 90 degrees F the enzymes within the plant begin to breakdown and photo-synthesis is affected. The same is true for low temperatures.

Carbon dioxide

Carbon dioxide is a gas that is essential for the light reactions in all plants that carry on photosynthesis. CO2 is absorbed through the leafs stomates and is combined with water and light energy to form glucose (used by the plant as energy) and oxygen (which is released). Therefore supplementing CO2 to the existing amount in the air will speed up photosynthesis and therefore, growth will occur faster. Experimentation has also shown that CO2 can help marijuana tolerate higher temperatures (up to 95 degrees F) with little affect on the rate of photosynthesis.

Water

Although only a small portion of water absorbed by the plant is used in photosynthesis a shortage of water does affect the rate photosynthesis occurs. This happens because when the plant is low on water the stomates on the leaves close preventing the release of waste gases and other toxic chemicals. This closure will severely slow down or even stop photosynthesis from occurring.

Sea of green

Sea of green, or SOG, is the theory of harvesting many small plants frequently, instead of large plants less frequently. In an SOG setup the closet is divided into two light tight spaces. In the top space the lights are permanently set on a 12/12 light/dark timer. On the bottom the lights are kept on for 18 hours per day. Fluorescent lights are used throughout. The bottom shelf is used to start seedlings and root clones. The top shelf is used for flowering. Using this setup harvesting can take place once a month.

Ventilation