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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.
A. victoriae-reginae is an evergreen perennial forming a rosette of thick, straight, mid-green, spine-tipped leaves to 30cm in length, with creamy-white flowers borne in narrow, erect or arching racemes to 4m in length
A. filifera is an evergreen perennial to 45cm, with compact rosettes of stiff, pointed leaves edged with long white fibres. Greenish-white flowers are borne in spikes on erect stems to 2.5m
A. macroacantha is a clump-forming, evergreen succulent, to 60cm tall and wide, comprising rosettes of narrow, pale blue-green leaves, up to 25cm long, with small brown teeth and a terminal black spine. After at least 15 years, purple-tinged green flowers may be borne on a branched stem up to 2m tall
'Mediopicta Alba' is an evergreen perennial forming striking rosettes of spiny-edged, grey-green leaves, each with a creamy-white central stripe. Flowers seldom seen
A. ovatifolia is a succulent perennial with rosettes, up to 1.5m high and 2m across, of almost white, pale blue-green leaves. The leaves are broad and almost egg-shaped in outline, with only small teeth on the scalloped edges but tipped at the ends with sharp spines. Flowering stems, when produced, are 1.5-2m high with yellow-green flowers in summer
'Mediopicta' is a succulent evergreen perennial to 1.5m, forming rosettes of spiny-edged, grey-green leaves, each with a central, creamy-yellow stripe. Rarely flowers
A. salmiana var ferox is a rosette-forming, evergreen, perennial succulent with a stout stem, capable of growing to 4m. The leaves are dark greyish-green, edged with hooked spines. After many years, bears dense clusters of greenish-yellow flowers, on upright, branched stems up to 10m tall
A. titanota is a medium-sized, evergreen, succulent plant, which forms a solitary rosette when young, but may produce offsets when mature. Leaves have ferocious-looking, curved and twisting light-brown, marginal spines, the bases of which often fuse along the leaf margins. There is also a long twisting spine at the leaf-tip. The plant is monocarpic and dies after flowering and setting seed. The flowers are yellow and are produced on a spike 3-6m in height
A. parviflora is a rosette-forming perennial to 20cm in height, with pointed dark green leaves marked with white and edged with white threads. Small pale yellow flowers in racemes on stems to 1.5m
A. stricta is a succulent evergreen perennial with rosettes of narrow, spine-tipped dark green leaves to 40cm long. Small reddish flowers borne in dense, erect racemes to 2m long
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