One seed-to-seed life cycle for an annual can occur in as little as a month in some species, though most last several months. Oilseed rape can go from seed-to-seed in about five weeks under a bank of fluorescent lamps. This style of growing is often used in classrooms for education. Many desert annuals are theropytes, because their seed-to-seed life cycle is only weeks and they spend most of the year as seeds to survive dry conditions.
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