Plume poppy (Macleaya microcarpa) will grow to 7ft tall in one season.Photograph: AlamyEuphorbia griffithii 'Dixter' grows to 2-3ft and is a champion marathon runner, so make sure you have room for it.Photograph: AlamyCommon bistort (Persicaria bistorta) will grow to about 2ft.Photograph: Alamy
Knotweed (Persicaria wallichii) is a 6ft bruiser.Photograph: Rob Whitworth/Getty Images/GAP Photos RMGeranium clarkei will creep through borders at ground level. This is the cultivar 'Kashmir Purple'.Photograph: AlamyMiscanthus sinensis 'Malepartus' is beautiful, dramatic, is unbothered by pests or diseases and grows to 6-8ft.Photograph: AlamyHelianthus 'Lemon Queen' is a perennial member of the sunflower family and is sturdy enough to stand on its own feet without help.Photograph: AlamyPerovskia atriplicifolia 'Blue Spire' is about 4ft high and produces loads of lavender-blue flowers from midsummer to autumn. To find out more about Nick Turrell's favourite fast-growing perennials, visit his feature here.Photograph: Alamy
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