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, are topped with an abundance of dark anthers quivering with purple pollen. As fast as the flowers come, they disappear. Each lasts a few days at the most and, although an established clump may produce scores of flowers, each one makes its own statement

coloured white, pink, green, mauve or smoky purple. Blooms may be plain or patterned. Plants will self-seed readily. Height/spread 45cm x 30cm.Lenten rose, Helleborus x hybridusProduces pendent, bowl-shaped, green flowers set against spiny, evergreen

and naturalise in borders, so any plants lost to frost should be replaced by their offspring.More features and advice on growing herbaceous perennialsLearn how to take verbena cuttingsGrow plants to attract beesChoose flowers for late-summer colour

staking than other varieties, which tend to have dense, heavy heads of petals.Cactus dahlias are perfect for providing extra colour to herbaceous borders, as they have such a long flowering season. They also come in a rangeof heights, so can be planted