Perennial Plants
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Perennial Plants, also called just “Perennials,” are plants whose life span is longer than two years. Perennial which continue to live through the year is a word derived from the Latin words “Per” meaning “through” and “Annus” meaning year. Perennials are longer-lived than other Annual Plants or Biennial Plants and once they are mature, they flower once a year.

In practice, a plant's status as Annual, Biennial, or Perennial often changes based on where it is grown (climate, precipitation) and how the garden is managed. Biennials grown for flowers, fruits, or seeds need to be grown for two years so they will flower and fruit. Biennials that are grown for their edible leaves or roots are more commonly grown as Annuals. True Perennials flower every year once they are mature, while Biennials take two years to flower their one and only time.

Perennials that grow and bloom over the spring and summer, die back every autumn and winter, and then return in the spring from their root-stock, are known as herbaceous perennials.