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Germination is the process by which a seed sprouts and a root emerges. Germination in cannabis can occur in as little as twelve hours or can take as long as eight days, depending on the cultivar and environmental conditions.
Autoflowering cannabis or day neutral cannabis varieties automatically switch from vegetative growth to the flowering stage based on age, as opposed to the ratio of light to dark hours required with photoperiod dependent/short-day strains. Many autoflowering varieties are ready to harvest in less than 10 weeks from seed.
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In contrast to cannabis for medical use, varieties grown for fiber and seed have less than 0.3% THC and are unsuitable for producing hashish and marijuana. [94] Present in industrial hemp, cannabidiol is a major constituent among some 560 compounds found in hemp.
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Some seeds germinate when the soil is cool 28–40 F (-2 - 4 C), and some when the soil is warm 76-90 F (24–32 C). Some seeds require exposure to cold temperatures (vernalization) to break dormancy. Some seeds in a dormant state will not germinate even if conditions are favorable.
Feral cannabis is an exceptionally hardy weed, widely dispersing its seeds which can lie dormant for 7–10 years before sprouting again. [4] In Minnesota, hemp is classified among the 11 "noxious prohibited weeds" along with several species of thistle, and noted for damaging farmers' plowing equipment.
Cannabis intoxication limits vary by state — anywhere from zero to 5 nanograms per milliliter of blood. But most clinical researchers say those numbers don’t correlate with impairment.