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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.
'Florentinum' is a stoloniferous perennial that forms mats of green leaves marked with silver variegation. In early summer, flowering stems bear whorls of hooded, yellow flowers in the leaf axils. Reaches a height of around 60cm
'Elizabeth de Haas' is an evergreen, prostrate perennial with broadly ovate green leaves blotched with yellow and with a central silver stripe, and short spikes of reddish-purple flowers in summer
L. galeobdolon is a European native wildflower. It bears toothed leaves in pairs on square stems. Yellow flowers are borne in whorls in the leaf axils in early summer. Like other deadnettles, flowers are lipped and hooded
'Beacon Silver' is an evergreen, mat-forming perennial to about 20cm, with silver leaves narrowly edged with green, and pink flowers in summer
'Ickwell Beauty' is a prostrate evergreen perennial with ovate green leaves, splashed with yellow, and with a narrow silver central stripe, and pink-tinged white flowers in summer
L. orvala is an herbaceous perennial forming a clump of attractive, ovate leaves, with spikes of whorled pinkish-purple flowers 4cm in length in late spring and summer
L. maculatum is a stoloniferous perennial forming a mat of prostrate leafy stems, with purple, white or pink flowers in spikes in summer
'White Nancy' is a spreading perennial to 20cm in height, forming a wide mat of heart-shaped silvery leaves, narrowly edged with dark green. Two-lipped white flowers in clusters forming a short leafy spike
'Album' is a clump-forming perennial 30-100cm high, with leaves up to 15cm long and 10cm wide, and flowering spikes with many whorls of creamy-white hooded flowers from late spring to summer; the flowers are good for pollinators
'Forncett Lustre' is a compact, mound-forming evergreen perennial with green-edged, silvery white leaves with a golden-yellow sheen, and salmon-pink flowers in summer
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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.