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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.
'Bow Bells' is a compact evergreen shrub, typically up to 1.5m tall, with purplish-bronze young growth and small, oval mid-green leaves. Loose clusters of bright pink, bell-shaped flowers, paler within and about 7cm in width, are borne in late spring
'Mariesii Grandiflora' is a small deciduous shrub with glossy ovate leaves and large, flattened Lace-cap flowerheads with blue or pink fertile florets surrounded by large, white sterile ones
'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
R. racemosum is a compact, upright evergreen shrub, to 2m tall, with small leathery, mid to dark green leaves, glaucous beneath, and abundant small clusters of funnel-shaped white, light or deep pink flowers, 3cm across, in early spring
'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
'Yellow Queen' is a cultivar of the vigorous, clump-forming species. In May and June it bears exaggeratedly spurred flowers, the central petals being dark yellow, the outer flower parts contrastingly lighter. Foliage is mid green, divided and fern-like
'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
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