Ed Rosenthal: Efficient Marijuana Cultivation Pt. I

Marijuana has two main stages of growth: vegetative and flowering. Most varieties are “short-day plants” (sdp), and their stage of growth is determined by the number of hours of uninterrupted darkness the plants receive. Most varieties respond to a critical dark period (cdp) of at least10.5 hours by initiating flowering. Other popular sdp’s are chrysanthemums and poinsettias.

Using techniques based on cdp, growers can easily manipulate plants to grow vegetatively or to flower at any time of the year in a grow room, greenhouse or outdoors, weather permitting. Growers can use this to their advantage in many ways. Some examples:

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