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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.
'Burrow Silver' is an evergreen perennial with narrow, cream-edged, green leaves and large, showy clusters of similarly variegated flower bracts, containing small green-yellow, flowers from early spring to mid summer
'John Tomlinson' is an erect, open-habited medium-sized evergreen perennial with narrow grey-green leaves and large rounded heads of bright yellow-green flowers
'Jimmy Platt' is an evergreen perennial or sub-shrub, a little over 1m tall and wide, with narrow, bluish, grey-green leaves with a pale midrib. Yellow-green flowers are produced in spring and summer
'Purple and Gold' is an evergreen subshrub or shrubby perennial to around 1.5m tall. Leaves are a dull green in summer but turn purple in autumn and winter. Large, bright yellow and green flowerheads are borne from spring into summer
E. × martini is a dwarf evergreen sub-shrub to 60cm in height, with narrow, dark grey-green leaves and open sprays of greenish-yellow flowers, sometimes purple-eyed
'Emmer Green is a compact, evergreen, perennial or sub-shrub to 60cm with grey-green foliage edged with cream, developing pink tinges in cold weather. Green and cream flowers with yellow centres are produced in late spring and early summer
'Black Pearl' is a compact cultivar of E. characias with lime green flowers and clearly visible black nectar glands
'Glacier Blue' is an evergreen perennial with narrow, cream-edged, blue-green leaves and large, showy clusters of creamy flowers, with green eyes, in spring and summer
'Portuguese Velvet' is a compact evergreen perennial to 60cm tall, with narrow grey-green leaves and cylindrical clusters of dark-eyed, bright greenish-yellow flowers from early spring to early summer
'Humpty Dumpty' is a compact, evergreen perennial to 60cm, with grey-green leaves and terminal clusters of bright, yellow-green flowers with a dark red eye
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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.