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All ratings refer to the UK growing conditions unless otherwise stated. Minimum
temperature ranges (in degrees C) are shown in brackets
AGM plants have been through a rigorous trial and assessment programme. They are:
This plant will provide nectar and pollen for bees and the many other types of pollinating insects.
It is included in an evolving list of plants carefully researched and chosen by RHS experts. Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually.
E. × perralchicum is an evergreen perennial to 40cm in height, forming a mat of leaves divided into 3-5 spiny-edged, ovate leaflets. Open sprays of bright yellow flowers 15mm in width
E. ogisui is a clump-forming rhizomatous perennial up to 35cm high, with evergreen leaves divided into three ovate to narrowly ovate, spiny-toothed leaflets, each up to 6cm long, which emerge marbled with red in spring and mature to mid-green, and spikes of pure white flowers up to 2.5cm across with wide sepals and petals with long, slightly curved spurs, from early spring to mid-spring; Epimedium leaves may be used for their nests by leaf-cutting bees
E. epsteinii is a dense, low-growing, evergreen perennial with bristle-edged, elongated heart-shaped leaves, bronze when young, and loose sprays of up to 30 white and grey-purple flowers, on 25cm stems, in spring
E. × cantabrigense is a carpeting perennial, to 45cm high, with ovate, toothed foliage, red-tinted when young, turning mid-green and finally red in autumn. Flowers are coppery-pink, with yellow inner petals, held on profusions of tall stems in spring
E. davidii is a deciduous perennial, to 30cm in height and 45cm spread, with bronze-tinted, toothed foliage in spring turning light green when mature. Yellow, long-spurred flowers, 2cm in width, open beneath russet-brown sepals which are carried on coral-red stems in spring
E. × rubrum is a deciduous, rhizomatous perennial to 30cm in height, with attractive, red-tinted young foliage which colours also in autumn. Flowers 2cm in width, crimson, with creamy-yellow spurs
'Akebono' is a pretty pale pink and white flowering cultivar. Flowers are borne from early to late spring. New foliage is red coloured as it emerges, fading to green
'Rose Queen' is an herbaceous perennial to 30cm, with compound leaves, bronze when young, and sprays of long-spurred rose-pink and white flowers 3.5cm in width
E. ecalcaratum is a clump-forming, rhizomatous perennial 30-65cm high, with evergreen pinnate leaves of three, five or seven ovate or almost rounded, spiny-edged leaflets, each 1.5-4cm long, which emerge green and light bronze and mature to bright green, and long, dark red stems, held well above the leaves, carrying spurless, bell-shaped, bright yellow flowers, each up to 1cm across and with tiny dark bronze-red sepals, from mid-spring to late spring; Epimedium leaves may be used for their nests by leaf-cutting bees
E. perralderianum is a slowly-spreading, evergreen perennial growing to 30cm tall. Each leaf has three glossy, oval leaflets with spiny margins that are tinted bronze when young, aging to a darker green. Up to 25 small, bright yellow flowers are held on stems just above the foliage in spring
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