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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!
Poppy (Great Scarlet)
Papaver bracteatum, Great Scarlet Poppy, Papaver orientale var. bracteatumVery imposing, sturdy plants with long, strong stems and large flower buds which break open to reveal huge 20cm (8in) flowers of startling red with black blotches. Plants require no support and ideally should be grown in groups at the back of the border. They look excellent when planted next to Red Hot Poker T&M Hybrids, T&M's Michaelmas Daisy Mixed and Rudbeckias. Flowers early summer. Height 122-152cm (4-5ft). More info
Geranium wallichianum 'Buxton's Blue'
Geranium wallichianum 'Buxton's Variety', Hardy Geranium, CranesbillThis is definitely the star of the perennial geranium family producing flowers virtually non-stop from mid summer to early autumn. The flowers themselves are a delight, a gorgeous clear opal, or Nemophila blue with large white centres, against which the dark stamens and dark veining of the petals contrast beautifully. The plant forms an attractive clump with attractive wedge shaped, silky, deeply toothed leaves, making this a very garden worthy plant even when not in flower. It also comes quite true from seed. Requirements: One of the easiest perennials to cultivate, happy in sun or light shade and any free draining garden soil. More info
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