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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
Tiny Tim is a dwarf, evergreen sub-shrub, to 40cm in height, with dark red stems bearing narrow, grey-green leaves flushed red in winter. Open sprays of lime green flowers, with red eyes, are produced in late spring and early summer
'Purpurea' is a softly downy evergreen perennial to 75cm tall, with deep purple stems and leaves, and contrasting lime-green flowers opening at the ends of the leafy stems in spring and early summer
E. milii var. splendens is a semi-prostrate to scrambling, slow growing, mainly evergreen, semi-succulent shrub. The stems are armed with well-spaced thorns and the small yellow flowers with their showy red bracts appear mostly in spring and 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
E. × pasteurii is an evergreen shrub forming a dome up to 1.5m tall and wide. Stiff, upward-curving stems bear narrow, green leaves with a creamy-white midrib and may in autumn take on red tinges. From early- to mid-summer, these stems are topped with clusters of honey-scented, yellow-brown flowers
'Dixter' is a spreading rhizomatous perennial to 90cm, making a thicket of erect stems clothed with narrow dark green, red-tinged leaves and ending in a cluster of bright orange-red flowers
'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
Excalibur is an upright perennial with young foliage wine-red in early spring, later grey-green, with sprays of bright yellow flower-heads in summer
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