Marijuana Horticulture: The Indoor/Outdoor Medical Grower's Bible

expelling grow room air.

Heavy insulation will keep grow room temperature easier to control and will help keep the heat signature inside.

This grow room has been lined with a material to keep the heat signature inside. For more information check www.hysupply.nl .
     
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CHAPTER ONE
MARIJUANA HORTICULTURE

    With a little care you too can have a beautiful crop of ‘Power Plant’ indoors or outdoors!

Introduction
    The key to successful indoor cannabis cultivation is to understand how cannabis produces food and grows. Cannabis, whether cultivated indoors or out, has the same requirements for growth. It needs light, air, water, nutrients, a growing medium, and heat to manufacture food and to grow. Without any one of these essentials, growth stops and death soon results. Indoors, the light must be of the proper spectrum and intensity; air must be warm, arid, and rich in carbon dioxide; water must be abundant but not excessive, and the growing medium must contain the proper levels of nutrients for vigorous growth. When all these needs are met consistently at optimum levels, optimum growth is the result.
    Cannabis is normally grown as an annual plant, completing its life cycle within one year. A seed that is planted in the spring will grow strong and tall through the summer and flower in the fall, producing more seeds. The annual cycle starts all over again when the new seeds sprout the following year. In nature, cannabis goes through distinct growth stages. The text and photos below show each stage of growth.

Life Cycle of Cannabis
    After 3-7 days of germination, plants enter the seedling growth stage which lasts about a month. During the first growth stage the seed germinates or sprouts, establishes a root system, and grows a stem and a few leaves.

Strong healthy ‘Chronic’ seeds from Serious Seeds germinated after being soaked in water overnight.

Sprouted seed was placed between two pieces of a rockwool seed block and caused virtually no transplant shock

Strong healthy seedling emerges from a Jiffy™ cube. The sprouted seed was carefully inserted into a hole with the taproot pointing down.

Sweet Purple (Paradise) seedling shows perfect symmetrical growth. Leaflets will increase from three to as many as eleven during vegetative growth.
Germination
    During germination moisture, heat, and air activate hormones (cytokinins, gibberellins, and auxins) within the durable outer coating of the seed. Cytokinins signal more cells to form and gibberellins to increase cell size. The embryoexpands, nourished by a supply of stored food within the seed. Soon, the seed’s coating splits, a rootlet grows downward, and a sprout with seed leaves pushes upwards in search of light.
Seedling Growth
    The single root from the seed grows down and branches out, similar to the way the stem branches up and out above ground. Tiny rootlets draw in water and nutrients (chemical substances needed for life). Roots also serve to anchor a plant in the growing medium. Seedling should receive 16-18 hours of light to maintain strong healthy growth.
Vegetative Growth
    Vegetative growth is maintained by giving plants 16-24 hours of light every day. As the plant matures, the roots take on specialized functions. The center and old, mature portions contain a water transport system and may also store food. The tips of the roots produce elongating cells that continue to push farther and farther into the soil in search of more water and food. The single-celled root hairs are the parts of the root that actually absorb water and nutrients. Without water, frail root hairs will dryup and die. They are very delicate and are easily damaged by light, air, and klutzy hands if moved or