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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:
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.
Other common names
knotweed 'Red Dragon'
Persicaria 'Red Dragon' Persicaria virginiana 'Red Dragon'
Polygonum 'Red Dragon'
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
'Red Dragon' is a vigorous, spreading perennial with lance-shaped, purplish-green leaves with a bold central splash of purple bordered by a silver chevron marking, and rounded clusters of tiny white flowers in late summer and autumn
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 West-facing or East-facing
Exposure Exposed or Sheltered
MoistureMoist but well-drained
SoilChalk, Loam, Sand
pHAcid, Alkaline, Neutral
Time to ultimate height
Grow in moist soil in sun or part-shade. Dense groundcover, spreading less quickly than the species
Propagate by stem tip cuttings or by division
Suggested planting locations and garden types
Banks and Slopes Flower borders and beds Ground Cover
Coastal Cottage & Informal Garden
Pruning Cut back in autumn
Pests Usually trouble free
Usually trouble free
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.