Growth rates and yields made large strides through the 1980s as growers discovered they could speed photosynthesis by supplying plants with all the nutrients, carbon dioxide, and light they could handle—vast amounts, as it turned out. (Cannabis is, after all, a weed.) Gardeners found that their plants could absorb hundreds of thousands of lumens—a blinding amount of light—twenty-four hours a day. Later on, by abruptly slashing their diet of light to twelve hours daily (and changing from metal halide to sodium lights, the frequency of which more closely mimics the autumn sun), growers could
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