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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.
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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.
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the RHS today and get 12 months for the price of 9
Other common names
dahlia 'Bishop of Llandaff'
Dahlia are tuberous rooted perennials with pinnately divided leaves and showy flowerheads, double in many cultivars, in summer and autumn
'Bishop of Llandaff' is an herbaceous perennial to 1m in height, with deep blackish-red foliage and semi-double brilliant red flowers 6cm in width
Toxicity All parts may cause severe discomfort if ingested and may irritate skin
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, Clay, Sand, Chalk
pHAcid, Neutral, Alkaline
Time to ultimate height
Grow in fertile, humus-rich, well-drained soil, enriched with organic matter and general purpose fertiliser, in full sun. Pinch out growing tips to encourage bushy plants and stake. Water freely in dry periods. Lift and store tubers in autumn to replant or use as a source of cuttings in spring
Propagate by softwood cuttings taken in spring from shoots from stored tubers, or divide the tubers ensuring each division has a viable bud
Suggested planting locations and garden types
Flower borders and beds Cut Flowers
City & Courtyard Gardens Cottage & Informal Garden
Pruning Deadhead to prolong flowering. Cut back to near ground level in the autumn, before lifting and storing for the winter
Pests Can get aphids, capsid bug, earwigs, caterpillars and glasshouse red spider mite
May be affected by a virus, tubers may rot in store
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
dahlia 'Bishop of Llandaff'
Buy from £9.99 at the RHS Plants Shop
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