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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.
'Godfrey Owen' is a rhizomatous perennial, up to 90cm high, with glaucous leaves and lemon-scented, ruffled flowers in early summer. The flowers have standards that are pale yellow edged with darker yellow, while the falls are white edged with yellow, and the beards bright yellow-orange
'Rosalie' is a compact, spreading heather to 15cm in height and 40cm wide, with dark bronze-green foliage and racemes of bright rosy-pink flowers from mid winter to spring
V. agnus-castus f. latifolia is a large, spreading, deciduous shrub with dark green, palmate leaves comprised of five or seven oval, pointed, aromatic leaflets. Branched sprays of small, purple (occasionally white or dark blue), fragrant flowers appear on the ends of the branches in early to mid-autumn
'Amber Beauty' is a medium-sized, conical, deciduous tree with shiny, golden-brown bark, peeling once mature. Small, scented, fluffy, white flowers are produced in clusters in spring, followed by small, black, cherry-like fruit. The small, dark green leaves turn yellow in autumn
'Fan Zinnoberrosa' is an upright bushy perennial to 60cm tall, usually grown as an annual, with narrow, dark green leaves and deep rose-red flowers 3cm wide, in dense spikes from mid summer to early autumn
C. hystrix is an almost leafless bushy shrub to 3m tall and wide, the grey-green stems bearing many sharp, rigid spines to 4cm long; tiny, fragrant white flowers open in small clusters on the spines in late summer and early autumn
S. nicolai is a massive, evergreen perennial, with oblong, grey-green leaf blades up to 1.5m long on 2m long leaf stalks. In spring it produces blue and white flowers, opening in succession, from blackish, beak-like spathes
'Roseum' is a compact spreading perennial to 10cm, with dark grey-green, oval, slightly lobed leaves and deep pink flowers 1.5cm in width, with darker veins
'Pendula Rosea' is a small deciduous tree forming a broad crown of arching-pendulous branches, with ovate leaves which turn orange and red in autumn. Small, single flowers open pale pink from deep rosy-pink buds
'Orange Glory' is a robust perennial to 1.5m in height, with light green foliage and terminal umbels of red-tipped orange-brown flowers, the inner segments deep yellow, tipped with orange-brown
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