Help us achieve our goals:
make a donation »
Join the RHS today and
support our charity
Free personalised gardening advice
RHS members get reduced ticket prices
RHS members get free access to RHS Gardens
Reduced prices on RHS Garden courses and workshops
020 3176 5800
Mon – Fri | 9am – 5pm
Make a donation
Join the RHS today and support our charity
I have forgotten my password
Keep me signed in
Register for free to receive our newsletters, add comments to blogs/articles and to save content.
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 1999
the RHS today and get 12 months for the price of 9
Other common names
blue eryngo 'Bethlehem'
Eryngium can be annuals, biennials or perennials with simple or divided leaves, often spiny edged, and cone-like flower-heads often surrounded by an involucre of conspicuous spiny bracts
'Bethlehem' is a perennial forming a clump of oblong dark green leaves and branched stems bearing small, slate-blue flower-heads with narrow bracts
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
SoilSand, Loam, Chalk
pHAcid, Alkaline, Neutral
Time to ultimate height
Grow in dry, well-drained soil that is poor to moderately fertile. Full sun is essential as is protection from winter wet
Propagate by root cuttings in late winter
Suggested planting locations and garden types
Flower borders and beds Cut Flowers
Coastal Cottage & Informal Garden Gravel Garden Wildlife Gardens
Pruning Although you can cut back flower stems after flowering the seedheads are a very attractive feature so are usually left over winter
Pests Can get leaf and bud eelworms
May be affected by powdery mildews and root rot
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.
Join the RHS today and get 12 months for the price of 9