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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:
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Other common names
penstemon 'Catherine de la Mare'
Penstemon may be deciduous or evergreen perennials or subshrubs, with simple, narrow leaves and racemes or panicles of bell-shaped or funnel-shaped flowers in summer and early autumn
'Catherine de la Mare' is a spreading, woody-based, semi-evergreen perennial to 50cm tall, with dull, bluish-green leaves and dense racemes of purplish-blue flowers 3cm long, borne on reddish stems in summer
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
MoistureMoist but well-drained
SoilLoam, Sand, Chalk
pHAlkaline, Acid, Neutral
Time to ultimate height
Grow in moderately fertile sharply-drained soil in full sun in a sheltered situation. May need a dry winter mulch in frost prone areas
Take softwood cuttings in early summer or semi-ripe cuttings in midsummer. Divide in spring or propagate by seed in late winter or spring; cultivars will not come true from seed
Suggested planting locations and garden types
Flower borders and beds Wall-side Borders
City & Courtyard Gardens Coastal Cottage & Informal Garden Gravel Garden Rock Garden
Pruning Best habit is encouraged by cutting back each year. Prune any winter damaged stems back hard to encourage fresh new growth from the base. After flowering, shorten flowered stems by half (unless seed is required) to encourage further flowering
Pests Slugs and snails, aphids and leaf and bud eelworm may be troublesome
May be affected by grey mould, powdery mildew and fungal leaf spot
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