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A biennial plant is a flowering plant that, generally in a temperate climate, takes two years to complete its biological life cycle. [1] [2] Background.
Plant biennial flowers and they'll bloom year after year. Find the best biennial flowers to plant in your garden, like foxgloves, black-eyed Susans, and more.
Smyrnium olusatrum is a stout, glabrous (hairless) biennial growing to 150 centimetres (59 in) tall (exceptionally 180 cm), with a solid stem up to 22 millimetres (7 ⁄ 8 in) in diameter, which becomes hollow and grooved with age.
The seeds of the plant are important food for birds, [16] including American goldfinch, Northern bobwhite, and mourning dove, and it is a larval host for both the primrose moth and the white-lined sphinx moth. [17] Bumblebees and honeybees also visit the flowers. [13] The primrose moth (Schinia florida) is a common consumer of Oenothera biennis ...
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This is an annual or biennial herb producing a single erect green to reddish stem up to 2 metres (6 ft 7 in) in maximum height. It is generally hairless and unscented. The frilly leaves are up to 13 centimetres (5.1 in) long and divided into thin, lance-shaped segments with long te