1 Geranium psilostemon – easily the most dramatic cranesbill, it produces startling, black-eyed, magenta flowers from May until October.
2 Polemonium Bressingham Purple – new Jacobs ladder with dark-chocolate leaves and deep blue flowers. Sterile hybrid so continues to flower until the frosts.
3 Astrantia major – there is a wealth of new varieties in pink and dark crimson or try growing your own from seed. The bracts last for months and new flowers appear from May till October.
4 Euphorbia griffithii Fireglow – Rampant magnificent fiery-orange and bronze bracts and foliage.
5 Epilobium angustifolium Album and Stahl Rose Again rampant tall spires of this white or soft-pink willow herb go on for ages.
6 Carex elata Aurea – the vivid yellow fountains of Mr Bowles Golden Sedge light up the whole garden for months.
7 Nepeta x faassenii – catmint is a stalwart ingredient of any summer mix. It bursts into flower with a swoosh in May, it will go on for months, especially with the benefit of a haircut in the middle of June.
8 Scabiosa ochroleuca and Knautia macedonica – all scabious are long-flowering. Literally hundreds of pin-cushion flowers are produced. Dead-heading is unnecessary as the seedheads are charming and they constitute important food for finches.
9 Geum Prinses Juliana – as bright an orange as orange can be, a multitude of flowers, constantly renewed. As the older stems spread out new, vivid flowers shoot from the centre with a Roman-candle effect.
10 Anthemis tinctoria E C Buxton – luscious lemon daisies on big bushy plants. Take the shears to it if it gets out of hand. It will recover immediately and be back in flower within weeks.
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