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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 winterberry black alder
feverbark swamp winterberry
Family Aquifoliaceae
Genus Ilex can be deciduous or evergreen shrubs and trees with often spiny leaves, small white flowers (male and female usually on separate plants) and, on female plants, showy berries in autumn
Details I. verticillata is a dense, suckering, deciduous shrub, growing to 2m tall, with bright green, oval to lance-shaped leaves with serrated margins. Insignificant greenish-white flowers, borne in spring, are followed on female plants by masses of long-lasting, glossy red berries
Plant range E. North America
Foliage Deciduous
Habit Suckering
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 South-facing or West-facing or East-facing or North-facing
Exposure Exposed or Sheltered
Clay
Loam
MoistureMoist but well-drained, Poorly-drained
SoilClay, Loam
pHAcid, Neutral
Ultimate height 1.5-2.5 metres
Ultimate spread 1-1.5 metres
Time to ultimate height 5-10 years
Cultivation Prefers a moist, acidic, organic loamy soil and has a good tolerance for poorly-drained soils so useful for boggy areas
Propagation Propagate by seed or by softwood cuttings
Suggested planting locations and garden types Hedging & Screens Banks and Slopes Low Maintenance Cottage & Informal Garden
Pruning Pruning group 1
Pests Generally trouble free
Diseases Generally trouble free
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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.