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To induce flowering, the plant must be subject to at least 8 hours of darkness per day; this number is very strain-specific and most growers use 12 hours of darkness. Flowers from certain plants (e.g. cannabis) are called bract/bracteole, and are (with cannabis) the most prized part of the plant.
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.
A Cannabis plant in the vegetative growth phase of its life requires more than 16–18 hours of light per day to stay vegetative. Flowering usually occurs when darkness equals at least 12 hours per day. The flowering cycle can last anywhere between seven and fifteen weeks, depending on the strain and environmental conditions.
These strains of cannabis are believed to have originated during the early 1980s in the United States prior to larger-scale development and popularization by Dutch growers. [45] Just as with other strains of cannabis, skunk is commonly grown in controlled indoor environments under specialized grow lights, or in a greenhouse when full outdoor ...
[19] [20] Cannabis x intersita Sojak, a strain identified in 1960, is a cross between C. sativa and C. ruderalis. [3] Attempts to produce a Cannabis strain with a shorter growing season are another application of cultivating C. ruderalis. [8] C. ruderalis when crossed with sativa and indica strains will carry the recessive autoflowering trait ...
The reproductive phase change of A. thaliana occurs by a sequence of two related events: first, the bolting transition (flower stalk elongates), then the floral transition (first flower appears). [13] Bolting is a robust predictor of flower formation, and hence a good indicator for vernalization research. [13]
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Luther Burbank (March 7, 1849 – April 11, 1926), [1] an American botanist, horticulturist, and pioneer in agricultural science, developed more than 800 strains and varieties of plants over his 55-year career. Burbank worked with (for example) fruits, flowers, grains, grasses, and vegetables.