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

the tender rootlet to prolonged intense light or air. Cover the germinated seed with one-quarter to one-half inch of moist rockwool. Keep the rockwool evenly moist. Once the taproot sprouts, small fuzzy feeder roots will grow in 12-14 days.
    Water penetrates the outer protective shell, continues to wick in, and activates dormant hormones that induce germination. Once a seed receives moisture, there must be a constant stream of moisture to transport nutrients, hormones, and water to carry on life processes. Letting germinated seed suffer moisture stress now will stunt or stop seedling growth. The black tip of the root tells me this is what has happened.

Seeds set inside rockwool blocks often heave up and out Germinate seeds before planting to avoid this common problem.
    Soggy growing mediums cut oxygen supplies and cause seeds to drown. Planting seeds too deeply causes poor germination. Seedlings do not have enough stored energy to force through too much soil beforesprouting. Plant seeds twice as deep as the width of the seed. eighth-inch (4 mm) seed one-quarter (8 mm) inch deep.
    Seeds do not need any extra hormones to germinate. Average household water contains enough dissolved solids to feed seeds through their first few weeks of growth. Supplemental nutrients will disrupt internal chemistry. Some growers prefer to use distilled water which contains virtually no dissolved solids to germinate seeds.
    Sow (direct seed) or move the sprout into a shallow planter, small seed pot, peat pellet, or rooting cube. Keep the planting medium evenly moist. Use a spoon to contain the root ball when transplanting from a shallow planter. Peat pellets or root cubes may be transplanted in two to three weeks or when the roots show through the sides. Feed with a dilute, quarter-strength fertilizer solution.
    Construct a moisture tent over the seedling container to help retain even grow-medium moisture. To build, place a baggie or piece of cellophane over the seeded soil. The cover will keep the humidity and temperature elevated. Seeds usually need only one initial watering when under a humidity tent. Remove the cover as soon as the first sprout appears aboveground. Leaving the tent on after seeds sprout through soil will lead to damping-off and other problems.
    Place planted seeds under an HID lamp to add dry heat while germinating. The heat dries soil, which requires more frequent watering. Place a heat pad or soil heating cables below growing medium to expedite germination. Marijuana seeds germinate and sprout quickest when the soil temperature is between 78-80°F (24-27.5°C) and the air temperature is 72-74°F (22-23°C). But stems will stretch between internodes if temperatures exceed 85°F (29°C) for long.

This outdoor grower made a seedbed from fine potting soil. He has started hundreds of seeds in this seedbed.

Plant seeds twice as deep as the seed is wide.
    Over-watering and under-watering are the biggest obstacles most growers face when germinating seeds and growing seedlings. Keep the soil uniformly moist, not waterlogged. Do not let the growing medium surface dry for long. Keep it evenly moist. Setting root cubes or planting flats up on a grate allows good drainage. A shallow flat or planter with a heat pad underneath may require daily watering, while a deep, one-gallon pot will need watering every three days or more. A properly watered flat of rockwool cubes needs water every three to five days when sprouting seeds. When the surface is dry (0.25-inch [7 mm] deep) it is time to water. Remember, there are few roots to absorb the water early in life, and they are very delicate.

This germinated seed was allowed to dry out for a little more than an hour. Notice how the tip of the root has shriveled. This seemingly small oversight caused the resulting plant to have a very slow start in life.
Grow More Females from Seed
    Environmental factors start influencing sex the moment the seedling has three pairs of true leaves (not counting cotyledons). Environmental factors that influence sex determination of cannabis include but are not limited to:
    Increasing the level of nitrogen makes more female plants. Lower the nitrogen level to create more male plants. Increase the level of potassium to increase male tendencies; lowering the potassium level encourages female plants. A higher nitrogen level and a lower potassium level for the first two weeks increases females.
    Low temperatures increase the number of female plants. Warm