Annual and Perennial (Biennial)
Annual plants die
each year, with a new generation replacing them the next year.
Perennial plants live
for more than a year. Biennial plants
live about 2 years.
Annual plants can
take advantage of short growing seasons, when conditions are optimal. For instance, a wet spring can produce lots
of annuals that take advantage of the plentiful water, with no need to reserve
energy to survive a subsequent dry period.

Wild Oats – photo courtesy William Follette
Perennial Plants
build up roots and stems that help them to grow and thrive over more than one
year.

Pacific Rush – photo © Neal Kramer
Want more? See Wikipedia.
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