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We have combined these two powerful search tools into a single Find a Plant service searching over 250,000 plant records.
Virtually all of the features of the old searches are still available and in addition we have added several new features to create a more comprehensive and user friendly search experience.
When using this search
Search by plant name, key attributes or both to find plant details and a list of
AGM plants have been through a rigorous trial and assessment programme. They are:
the RHS today and get 12 months for the price of 9
Other common names
red bistort 'Superba'
Polygonum bistorta 'Superbum'
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
'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
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
Aspect South-facing or East-facing or West-facing
Exposure Exposed or Sheltered
MoistureMoist but well-drained, Poorly-drained
SoilClay, Loam, Sand, Chalk
pHAlkaline, Neutral, Acid
Time to ultimate height
Ideal for a moist soil although it can tolerate some dryness; copes in full sun or partial shade
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
Generally disease free
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
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.
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Join the RHS today and get 12 months for the price of 9