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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 feather reed-grass 'Overdam'
Synonyms Calamagrostis 'Overdam'
Family Poaceae
Genus Calamagrostis are robust rhizomatous perennial grasses, forming tufts of linear leaves, with erect stems bearing dense branching flowering panicles in summer
Details 'Overdam' is a compact tufted grass forming a clump of narrow, yellow to cream-striped leaves, with airy purplish sprays of flower becoming pale brown in winter
Foliage Deciduous
Habit Bushy
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H6
Full Sun
Partial Shade
Aspect East-facing or South-facing or North-facing or West-facing
Exposure Exposed or Sheltered
Chalk
Clay
Loam
Sand
MoistureMoist but well-drained, Well-drained
SoilChalk, Clay, Loam, Sand
pHAcid, Alkaline, Neutral
Ultimate height 0.5-1 metres
Ultimate spread 0.1-0.5 metres
Time to ultimate height 2-5 years
Cultivation Easy to grow in most moist, humus-rich, well-drained fertile soils, but will tolerate all but the poorest soils
Propagation Propagate by division in mid-spring
Suggested planting locations and garden types Flower borders and beds Banks and Slopes Patio & Container Plants Architectural Cottage & Informal Garden
Pruning Cut back old stems to the ground in early spring before growth resumes
Pests Generally pest free
Diseases May be affected by a rust
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