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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.
'Variegatum' is a semi-evergreen perennial forming a low clump to 10cm in height, with fleshy, bluntly toothed obovate leaves margined with creamy-white and tinged pink, and loose clusters of starry bright yellow flowers in late summer
'Purple Emperor' is a compact, clump-forming deciduous perennial to 50cm tall, with broad, deep purple leaves on dark red stems, and rounded clusters of small, pale purplish-pink flowers in late summer
'Euphorbioides' is a deciduous perennial, to 30cm tall, with a stout rootstock and upright, red stems bearing slightly fleshy, stalkless leaves. Flattened, terminal clusters of star-shaped, rich yellow flowers are produced in summer
'Angelina' is an evergreen, low-growing, mat-forming perennial to 15cm tall and 60cm wide. The cylindrical, linear leaves are a bright yellow in the spring, maturing to yellow-green in the summer with orange and red autumnal tints. Upright stems carry clusters of small, yellow flowers in the summer
'Vera Jameson' is an herbaceous perennial forming a clump to 30cm in height, with spreading stems and ovate glaucous leaves strongly tinged with purplish-pink. Starry rose-pink flowers in rounded clusters to 6cm in width in late summer and early autumn
'Joyce Henderson' is an herbaceous perennial to 60cm tall, with fleshy, ovate, grey-green leaves tinged purple near the margins, and dense clusters of pale pink flowers with dark-pink anthers on purple stems in summer and early autumn
'Matrona' is an upright deciduous perennial to 60cm tall, with large, ovate grey-green leaves tinged purple near the margins, and dense clusters of pale pink flowers in summer and early autumn
'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
'Cape Blanco' is an evergreen perennial forming a wide mat to 10cm in height, with thick, purple-tinged grey-green leaves, the inner ones white-bloomed. Starry yellow flowers 15mm width are carried in small terminal clusters
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We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.