Page "Annual plant" Paragraph 3

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 rapa 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 therophytes, because their seed-to-seed life cycle is only weeks and they spend most of the year as seeds to survive dry conditions.