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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 Forrest St John's wort
Synonyms Hypericum patulum var. forrestii
Family Hypericaceae
Genus Hypericum can be annuals, perennials, shrubs or trees, evergreen or deciduous, with usually paired leaves and showy yellow flowers with prominent stamens, followed by capsules, occasionally berry-like
Details H. forrestii is a small, semi-evergreen shrub with ovate leaves which turn orange and red in winter. Flowers saucer-shaped, to 5cm in width, clear yellow
Plant range China to NE Myanmar
Foliage Semi-evergreen
Habit Bushy
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H5
Full Sun
Partial Shade
Aspect East-facing or South-facing or North-facing or West-facing
Exposure Exposed or Sheltered
Chalk
Clay
Loam
Sand
MoistureMoist but well-drained, Well-drained
SoilChalk, Clay, Loam, Sand
pHAcid, Alkaline, Neutral
Ultimate height 1-1.5 metres
Ultimate spread 1-1.5 metres
Time to ultimate height 5-10 years
Cultivation Grows well in moist but well-drained soil in sun or partial shade
Propagation Propagate by seed sown in containers in autumn or by semi-hardwood cuttings in summer
Suggested planting locations and garden types Banks and Slopes Low Maintenance Flower borders and beds Hedging & Screens City & Courtyard Gardens Coastal Cottage & Informal Garden
Pruning Pruning group 1 or pruning group 6
Pests Generally pest free
Diseases Generally disease free
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