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Plant life cycles differ. Often
plants are described as annual, perennial , or biennial, according to how
long it takes them to seed, grow, flower and bear their own seeds before
dying. |
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 Perennials,
such as roses, can live for three or more years. |
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 Biennials,
such as carrots, complete their life cycles in about two years. |
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Annuals,
such as tomatoes, complete their cycle in a year. They must be planted
again the following year.