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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.
the RHS today and get 12 months for the price of 9
Other common names
blue wood 'Sweet Lavender'
Aster cordifolius 'Sweet Lavender'
Symphyotrichum includes around 90 species of annuals, biennials and perennials, mostly spread through the Americas, that were formerly included within the genus Aster. Leaves are simple, lance-shaped and entire, but it is their daisy-like flowerheads that they are grown for; central disc florets are typically yellow, surrounded by strap-shaped ray florets in shades of pink, blue, purple or white
'Sweet Lavender' is an herbaceous perennial to 1.2m, with dark green leaves and open, arching sprays of small, lavender-blue flowers 2cm wide in autumn
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
Aspect East-facing or South-facing or North-facing or West-facing
Exposure Exposed or Sheltered
MoistureMoist but well-drained
SoilChalk, Clay, Loam, Sand
pHAcid, Alkaline, Neutral
Time to ultimate height
Grow in well-cultivated, fertile, moist soil in sun or partial shade; may need staking
Propagate by division in spring; division every third year to maintain vigour
Suggested planting locations and garden types
Flower borders and beds
Coastal Cottage & Informal Garden Wildlife Gardens
Pruning Cut back in late autumn
Pests Generally pest free
Asters may suffer Verticillium wilt, powdery mildews and grey moulds
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.