Biennials are plants that spend the first year developing a leaf rosette and directing their energy into the growth of the root. During their second year these plants produce a long flowering stalk with plenty of seeds. Some plants act annual or biennial (e.g. henbane or poppies), depending on the time of sowing. Usually the biennial variant grows larger and stronger than the annual variant of a plant. The best time to sow biennials is in the month of July. Examples for biennials are:

Some of the above listed plants may also behave as short lived perennials, e.g. if dead-headed before setting seed. Besides these some annual plants may act as biennials, e.g. if sown in late summer or autumn:

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