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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 big betony
Synonyms Stachys grandiflora Stachys spicata
Stachys macrantha Betonica grandiflora
Family Lamiaceae
Genus Betonica is a genus of native perennial wildflowers with narrow, oval leaves on upright stems. Bright purple to red flowers appear throughout the summer and into early autumn.
Details S. macrantha is an upright perennial to 60cm tall, with neatly toothed, oblong leaves and hooded pinky-purple flowers, 3.5cm long, in dense spikes in summer and early autumn
Foliage Deciduous
Habit Bushy
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H7
Full Sun
Partial Shade
Aspect West-facing or East-facing or South-facing
Exposure Exposed or Sheltered
Chalk
Loam
Sand
MoistureMoist but well-drained, Well-drained
SoilChalk, Loam, Sand
pHAcid, Alkaline, Neutral
Ultimate height 0.5-1 metres
Ultimate spread 0.1-0.5 metres
Time to ultimate height 2-5 years
Cultivation Grow in moderately fertile, well-drained soil in full sun or partial shade
Propagation Divide in spring. Propagate by seed in spring or autumn and keep in a cold frame
Suggested planting locations and garden types Flower borders and beds Underplanting of Roses and Shrubs City & Courtyard Gardens Coastal Cottage & Informal Garden Wildlife Gardens
Pruning Remove flowered stems
Pests Slugs and snails may be a problem
Diseases May be affected by powdery mildews
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