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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!
Potentilla thurberi 'Monarch's Velvet'
Of all garden Potentillas, this must surely be one of the most attractive. Heart-shaped, rich raspberry red petals forming saucer-shaped flowers; a wonderful colour in its own right - but add a deep velvet red centre, appearing just like an ink blot which has diffused outwards and the flowers radiate beauty; a real garden treasure. Flowering over a long period, an absolute must for the perennial border and cottage garden alike. Flowers summer. Height: 60-90cm (24-36in).More info
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