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Biennials live for 2 years, whereas perennials live for longer. As a general rule, biennial and perennial seeds should be sown in spring, but some can be sown in autumn as well. Many varieties will self-seed after flowering, giving you even more plants!
Dipsacus fullonum, Dipsacus sylvestrisMore info
Honesty, Lunaria biennisMore info
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