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Are these long-term plants?

Biennials are plants that flower in their second year of growth. In gardens, they are sown in spring and early summer for flowering during the following year, when they are usually discarded after they cease flowering. However, many biennials are actually perennial in nature, and will continue growing and reseeding themselves. Herbaceous perennials, once planted, have life-spans of 3–5 years before they become congested and need to be divided.