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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
milk thistle blessed Mary's thistle
blessed thistle holy thistle lady's milk lady's thistle leaves of Mary Mary's thistle Our Lady's milk thistle Our Lady's thistle St Mary's thistle
Silybum are large annuals and biennials, with basal rosettes of large, lobed leaves and thistle-like purple flower-heads with spiny bracts in summer
S. marianum is a robust biennial forming a rosette of large, spiny dark green leaves with prominent white veins, and with purple flower-heads with spiny bracts, in the second year
Mediterranean, SW Europe to Afghanistan
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
Exposure Sheltered or Exposed
Time to ultimate height
Grow in poor to medium fertile, well-drained, neutral to slightly alkaline soil in full sun. Protect from excess winter wet
Propagate by seed sown in late spring or early summer
Suggested planting locations and garden types
Flower borders and beds
Architectural City & Courtyard Gardens Cottage & Informal Garden Mediterranean Climate Plants
Pruning No regular pruning required, but flower stems may be removed to keep foliage effect
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.