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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.
'Herbstfreude' is an herbaceous perennial forming a clump to 60cm in height, with fleshy, oblong, glaucous green leaves and large flat terminal clusters of starry flowers in early autumn. The flowers open from greenish-pink buds, rapidly progressing through pale pink to become deep pink and ultimately taking on a brownish hue
H. spectabile is an herbaceous perennial to 45cm, with thick erect stems bearing shallowly scalloped, broadly elliptic, grey-green leaves and starry pink flowers in flat terminal clusters to 15cm across in late summer
'Iceberg' is a deciduous, clump-forming plant with stout stems bearing fleshy ovate, pale grey-green leaves and domed clusters of starry white flowers in late summer and early autumn
'Stardust' is a clump-forming perennial with grey-green leaves. Flat-topped, white flowerheads are produced from mid-summer to autumn. Height and spread about 45cm
'Brilliant' is a clump-forming herbaceous perennial to 45cm in height, with thick stems and broadly elliptic, grey-green leaves and flat terminal cymes of dark-centred, bright pink flowers from late summer
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