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Двулетниками называют короткоживущие растения с двулетним жизненным циклом. В первый год растение наращивает розетку листьев, во второй цветет и плодоносит, чаще всего отмирая. 

Если вам кажется, что турецкая гвоздика или наперстянка – многолетники и цветут десятилетия, то это не так: они возобновляются самосевом. Кстати, двулетников в садах до обидного мало, они заслуживают большего внимания.