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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 Allegheny monkey flower
Family Phrymaceae
Genus Mimulus can be annuals, perennials or evergreen shrubs, with paired leaves and 2-lipped tubular or trumpet-shaped flowers in terminal racemes or in the leaf axils
Details A upright, deciduous perennial that grows to a height of up to 50cm, with long, narrow green leaves and pale purple or sometimes white flowers in summer
Foliage Deciduous
Habit Columnar/Upright
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H4
Partial shade
Full sun
Aspect West-facing or South-facing or East-facing
Exposure Sheltered
Chalk
Clay
Sand
Loam
MoisturePoorly-drained, Moist but well-drained
SoilChalk, Clay, Sand, Loam
pHAcid, Neutral, Alkaline
Ultimate height 0.5-1 metres
Ultimate spread 0.1-0.5 metres
Time to ultimate height 2-5 years
Cultivation Grow in fertile, very moist soil in sun or partial shade, ideal for damp beds or bog gardens
Propagation Propagate by seed
Suggested planting locations and garden types Flower borders and beds Garden Edging Low Maintenance Wall-side Borders Cottage & Informal Garden
Pruning Cut back old growth at the end of the season
Pests May be susceptible to damage by slugs and snails
Diseases May be susceptible to powdery mildews
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The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.