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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:
© RHS 2002
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Other common names
Knautia can be annuals or perennials, and may have simple or pinnately lobed leaves and scabious-like flower-heads
K. macedonica is an herbaceous perennial to 75cm in height, with pinnately lobed basal leaves and simple or lobed stem leaves, with a succession of deep crimson flower-heads 3-4cm across, from mid-summer
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
Exposure Exposed or Sheltered
SoilLoam, Chalk, Sand
Time to ultimate height
Grow in a moderately fertile, well-drained, preferably alkaline soil in full sun
Propagate by seed in pots in a cold frame in spring or propagate by basal cuttings in spring
Suggested planting locations and garden types
Flower borders and beds Cut Flowers
Cottage & Informal Garden Prairie Planting Gravel Garden
Pruning Old flower stems can be cut down after flowering
Pests May be attacked by aphids
Generally disease free
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
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Join the RHS today and get 12 months for the price of 9