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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.
'Diana Clare' is a vigorous semi-evergreen perennial with narrow silvery-green leaves, lightly speckled with dark green near the margins, and violet-blue flowers from late winter to late spring
Opal is a semi-evergreen perennial with ovate leaves heavily blotched and speckled with silver; clear pale blue flowers open from pale pink buds in spring on stems to 35cm tall
Argentea Group are herbaceous perennials to 30cm, forming a clump of ovate, green-edged, silvery leaves, with leafy stems bearing deep violet-purple flowers opening from dull red buds
'David Ward' is a semi-evergreen perennial to 35cm tall, with unspotted, pale green leaves edged with white margins, and coral-red flowers in late winter and early spring
'Blue Ensign' is a strong-growing deciduous perennial to 30cm tall, with broad, dark green leaves and compact clusters of large, violet-blue flowers in spring
'Pink Haze' PBR is a low-growing perennial with a dense, mounding habit growing to 30cm tall. The leaves are a bright green dappled with grey-green spots. Saucer-shaped, open flowers up to 2cm in length and diameter and coloured clear pink tinted with violet-blue are borne in spring
'Ann' is a semi-evergreen perennial to 40cm tall, with light green leaves faintly spotted with pale green, and clusters of white and pink "variegated" flowers in late winter and early spring
'Trevi Fountain' is a low-growing, herbaceous perennial with broad, pointed leaves heavily marked with large and small silver spots. Clusters of blue, bell-shaped flowers are produced in mid- to late spring
'Ankum' is a semi-evergreen perennial to 30cm tall, with narrow, silver-blotched leaves and dense clusters of vivid blue flowers in spring
'Majesté' is a low-growing, semi-evergreen perennial with many leaves completely silvered, some just showing a fine green edge, and others mottling towards the base. Small sprays of flowers start pink and turn blue, and are produced from early to late spring
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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.