Herbaceous plants are typically categorised as annuals, biennials or perennials. Annuals like impatiens, snapdragons and petunias are plants that die after one year or a growing season. Biennials are a flowering plant that takes two years to complete its lifecycle – it grows leaves, stems, and roots in the first year, then enters a period of dormancy over the cooler months. During warmer months, the stem of the biennial plant elongates and flowers (like the Black-eyed Susan), producing fruits and seeds before it finally dies. Perennials live for over two years and are typically small flowering plants that grow and blossom in spring and summer, die back in autumn and winter, then return again in the spring. Get more information on well-known perennials like Chicory and dahlias with our guide to Herbaceous plants.