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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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Other common names Iberian comfrey
Family Boraginaceae
Genus Symphytum are rhizomatous herbaceous perennials, sometimes invasive, with large leaves and nodding clusters of tubular flowers
Details S. ibericum is a perennial to 40cm in height, with ovate leaves and pale yellow flowers opening from red buds in late spring
Plant range Cauc. & NE Turkey
Foliage Deciduous
Habit Spreading / Branched
Toxicity Ingestion may cause severe discomfort
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H6
Full Sun
Partial Shade
Aspect West-facing or South-facing or East-facing
Exposure Exposed or Sheltered
Chalk
Clay
Loam
Sand
MoistureMoist but well-drained, Poorly-drained
SoilChalk, Clay, Loam, Sand
pHAcid, Alkaline, Neutral
Ultimate height 0.1-0.5 metres
Ultimate spread 0.5-1 metres
Time to ultimate height 2-5 years
Cultivation Grow in moderately fertile, moist soil in full sun or partial shade. Can be invasive so site with care
Propagation Propagate by division of fleshy roots in spring. Propagate by root cuttings in early winter. Propagate by seed sown in pots in a cold frame in autumn or spring
Suggested planting locations and garden types Banks and Slopes Flower borders and beds Ground Cover Cottage & Informal Garden Wildlife Gardens
Pruning Cut back after flowering to encourage neat, young foliage
Pests Generally pest free
Diseases Generally disease free
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
Iberian comfrey
Buy from £5.99 at the RHS Plants Shop
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