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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 red bistort 'Superba'
Synonyms Polygonum bistorta 'Superbum'
Family Polygonaceae
Genus Persicaria can be annuals, herbaceous or evergreen perennials or sub-shrubs with simple leaves and small bell-shaped white or pink flowers in long-lasting spikes or panicles
Details 'Superba' is a vigorous clump-forming herbaceous or semi-evergreen perennial to 90cm in height, with strongly veined, finely pointed ovate leaves and dense spikes of small light pink flowers
Foliage Semi-evergreen
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 West-facing or East-facing or South-facing
Exposure Exposed or Sheltered
Chalk
Clay
Loam
Sand
MoistureMoist but well-drained, Poorly-drained
SoilChalk, Clay, Loam, Sand
pHAcid, Alkaline, Neutral
Ultimate height 0.5-1 metres
Ultimate spread 0.5-1 metres
Time to ultimate height 2-5 years
Cultivation Ideal for a moist soil although it can tolerate some dryness; copes in full sun or partial shade
Propagation Propagate by division in spring or autumn
Suggested planting locations and garden types Banks and Slopes Flower borders and beds Coastal Cottage & Informal Garden Wildflower meadow
Pruning Deadhead faded spikes
Pests Generally pest free
Diseases Generally disease free
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red bistort 'Superba'
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