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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.
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Other common names astilbe 'Superba'
Synonyms Astilbe 'Superba'
Family Saxifragaceae
Genus Astilbe are rhizomatous herbaceous perennials with attractive, usually ternately divided leaves and erect plume-like panicles of tiny white, pink or purple flowers in summer. The old, brown flower-heads remain attractive in autumn
Details 'Superba' is a vigorous herbaceous perennial to 1.2m, with divided leaves and erect, narrow, dense spikes of rosy-mauve flowers
Foliage Deciduous
Habit Clump-forming
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H7
Full Sun
Partial Shade
Aspect South-facing or West-facing or East-facing
Exposure Exposed or Sheltered
Loam
MoistureMoist but well-drained, Poorly-drained
SoilLoam
pHAcid, Alkaline, Neutral
Ultimate height 1-1.5 metres
Ultimate spread 0.1-0.5 metres
Time to ultimate height 2-5 years
Cultivation Grow in moist, fertile, humus-rich soil in full sun or grow in partial shade where soil is likely to dry out in the summer. Plants must be divided every three to four years to maintain vigour.
Propagation Propagate by division in late winter or early spring, pot divisions under glass and plant out in late spring.
Suggested planting locations and garden types Flower borders and beds Cottage & Informal Garden
Pruning Cut back after flowering
Pests Generally pest free
Diseases Powdery mildews may be troublesome
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