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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
While we update our systems with the new hardiness ratings you may still see old
hardiness ratings in your search results. These are denoted as 'Old'.
For full details of the hardiness ratings see
AGM plants have been through a rigourous trial and assessment programme. They are:
A. maritima is a mat-forming evergreen perennial with dense, needle-like leaves and erect scapes to 15cm, bearing compact clusters of cup-shaped pink flowers in late spring and summer
A. alpinus is an herbaceous perennial forming a clump to 30cm in height, with narrow dark green leaves and daisy-like flowerheads to 5cm in width, with blue-violet rays and a yellow centre
G. cordifolia is an evergreen, woody-based perennial to 10cm in height, forming a mat of small spoon-shaped leaves. Flowers small, pale lavender-blue, in fluffy heads 2cm in width
L. serotina is a robust perennial to 1.8m in height, with toothed, oblong, dark green leaves and greenish-yellow centred white daisies 7cm in width
A. montana is a low evergreen perennial forming a loose mat to 30cm in width, of small, rich green, elliptic leaves, with erect stems to 10cm in height, each carrying a few pure white flowers 1.5-2cm in width in early summer
L. vulgare is a rhizomatous perennial with dark green spoon-shaped leaves and solitary white, daisy-like flowerheads with yellow disk florets, in late spring and early summer
E. purpurea is an upright perennial with coarsely hairy, ovate or lance-shaped leaves and solitary flower-heads to 12cm across with slightly reflexed, light purple rays and brown central disk
R. hosmariense is a woody-based spreading perennial to 30cm in height, with silvery leaves divided into narrow segments, and solitary yellow-centred white daisies held just above the foliage
'Aglaia' is a perennial forming a clump to 60cm in height, with narrow, dark glossy green leaves and semi-double white flowers 10-12cm in width, with a trace of yellow in the centre
R. acris is an upright perennial with long-stalked, palmately divided leaves and open panicles of bright glossy yellow, bowl-shaped flowers 2.5cm across
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