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Cannabis Botany
by R. C. Clarke
CHAPTER 1
Sinsemilla Life Cycle of Cannabis
CHAPTER 2
Propagation of Cannabis
CHAPTER 3
Genetics and Breeding of Cannabis
CHAPTER 4
Maturation and Harvesting of Cannabis
Chapter 1 - Sinsemilla Life Cycle of Cannabis
Cannabis is a tall, erect, annual cannabis. Provided with an open sunny environment, light well-drained composted soil, and ample irrigation, Cannabiscan grow to a height of 6 meters (about 20 feet) in a 4-6 month growing season. Exposed river banks, meadows, and agricultural lands are ideal habitats for Cannabis since all offer good sunlight. In this example an imported seed from Thailand is grown without pruning and becomes a large female plant. A cross with a cutting from a male plant of Mexican origin results in hybrid seed which is stored for later planting. This example is representative of the outdoor growth of Cannabis in temperate climates.
Seeds are planted in the spring and usually germinate in 3 to 7 days. The seedling emerges from the ground by the straightening of the hypocotyl (embryonic stem). The cotyledons (seed leaves) are slightly unequal in size, narrowed to the base and rounded or blunt to the tip. The hypocotyl ranges from 1 to 10 centimeters (1A to 3 inches) in length. About 10 centimeters or less above the cotyledons, the first true leaves arise, a pair of oppositely oriented single leaflets each with a distinct petiole (leaf stem) rotated one-quarter turn from the cotyledons. Subsequent pairs of leaves arise in opposite formation and a variously shaped leaf sequence develops with the second pair of leaves having 3 leaflets, the third 5 and so on up to 11 leaflets. Occasionally the first pair of leaves will have 3 leaflets each rather than 1 and the second pair, 5 leaflets each.
If a plant is not crowded, limbs will grow from small buds (located at the intersection of petioles) along the main stem. Each sinsemilla (seedless drug Cannabis) plant is provided with plenty of room to grow long axial limbs and extensive fine roots to increase floral production. Under favorable conditions Cannabis grows up to 7 centimeters (21A inches) a day in height during the long days of summer.
Cannabis shows a dual response to daylength; during the first two to three months of growth it responds to increasing daylength with more vigorous growth, but in the same season the plant requires shorter days to flower and complete its life cycle.
LIFE CYCLE OF CANNABIS I Juvenile Stage
Cannabis flowers when exposed to a critical daylength which varies with the strain. Critical daylength applies only to plants which fail to flower under continuous illumination, since those which flower under continuous illumination have no critical daylength. Most strains have an absolute requirement of inductive photoperiods (short days or long nights) to induce fertile flowering and less than this will result in the formation of undifferentiated primordia (unformed flowers) only.
The time taken to form primordia varies with the length of the inductive photoperiod. Given 10 hours per day of light a strain may only take 10 days to flower, whereas if given 16 hours per day it may take up to 90 days. Inductive photoperiods of less than 8 hours per day do not seem to accelerate primordia formation. Dark (night) cycles must be uninterrupted to induce flowering (see appendix).
I DO NOT OWN THIS!
NO COPYRIGHT INFRINGEMENT INTENDED!
Cannabis Botany
by R. C. Clarke
CHAPTER 1
Sinsemilla Life Cycle of Cannabis
CHAPTER 2
Propagation of Cannabis
CHAPTER 3
Genetics and Breeding of Cannabis
CHAPTER 4
Maturation and Harvesting of Cannabis
Chapter 1 - Sinsemilla Life Cycle of Cannabis
Cannabis is a tall, erect, annual cannabis. Provided with an open sunny environment, light well-drained composted soil, and ample irrigation, Cannabiscan grow to a height of 6 meters (about 20 feet) in a 4-6 month growing season. Exposed river banks, meadows, and agricultural lands are ideal habitats for Cannabis since all offer good sunlight. In this example an imported seed from Thailand is grown without pruning and becomes a large female plant. A cross with a cutting from a male plant of Mexican origin results in hybrid seed which is stored for later planting. This example is representative of the outdoor growth of Cannabis in temperate climates.
Seeds are planted in the spring and usually germinate in 3 to 7 days. The seedling emerges from the ground by the straightening of the hypocotyl (embryonic stem). The cotyledons (seed leaves) are slightly unequal in size, narrowed to the base and rounded or blunt to the tip. The hypocotyl ranges from 1 to 10 centimeters (1A to 3 inches) in length. About 10 centimeters or less above the cotyledons, the first true leaves arise, a pair of oppositely oriented single leaflets each with a distinct petiole (leaf stem) rotated one-quarter turn from the cotyledons. Subsequent pairs of leaves arise in opposite formation and a variously shaped leaf sequence develops with the second pair of leaves having 3 leaflets, the third 5 and so on up to 11 leaflets. Occasionally the first pair of leaves will have 3 leaflets each rather than 1 and the second pair, 5 leaflets each.
If a plant is not crowded, limbs will grow from small buds (located at the intersection of petioles) along the main stem. Each sinsemilla (seedless drug Cannabis) plant is provided with plenty of room to grow long axial limbs and extensive fine roots to increase floral production. Under favorable conditions Cannabis grows up to 7 centimeters (21A inches) a day in height during the long days of summer.
Cannabis shows a dual response to daylength; during the first two to three months of growth it responds to increasing daylength with more vigorous growth, but in the same season the plant requires shorter days to flower and complete its life cycle.
LIFE CYCLE OF CANNABIS I Juvenile Stage
Cannabis flowers when exposed to a critical daylength which varies with the strain. Critical daylength applies only to plants which fail to flower under continuous illumination, since those which flower under continuous illumination have no critical daylength. Most strains have an absolute requirement of inductive photoperiods (short days or long nights) to induce fertile flowering and less than this will result in the formation of undifferentiated primordia (unformed flowers) only.
The time taken to form primordia varies with the length of the inductive photoperiod. Given 10 hours per day of light a strain may only take 10 days to flower, whereas if given 16 hours per day it may take up to 90 days. Inductive photoperiods of less than 8 hours per day do not seem to accelerate primordia formation. Dark (night) cycles must be uninterrupted to induce flowering (see appendix).