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We have combined these two powerful search tools into a single Find a Plant service searching over 250,000 plant records.
Virtually all of the features of the old searches are still available and in addition we have added several new features to create a more comprehensive and user friendly search experience.
When using this search
Search by plant name, key attributes or both to find plant details and a list of
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.
the RHS today and get 12 months for the price of 9
Other common names
grey alder gray alder
American black alder common black alder hoary-leaved alder speckled alder
Alnus are vigorous deciduous trees and large shrubs with rounded leaves and often conspicuous catkins in winter
A. incana is a conical tree, to 20m, with dark-green leaves to 10cm long, grey-white and hairy beneath. Yellow-brown male catkins in pendent clusters of 3 or 4 are produced in late winter or early spring, before the leaves. Ovoid fruit is produced in summer
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
Aspect North-facing or West-facing or East-facing or South-facing
Exposure Exposed or Sheltered
MoistureWell-drained, Poorly-drained, Moist but well-drained
SoilSand, Chalk, Loam, Clay
pHAcid, Alkaline, Neutral
Higher than 12 metres
wider than 8 metres
Time to ultimate height
Grow in moderately fertile, moist but well-drained soil in full sun or part shade. Noted for its ability to thrive in poor, wet conditions but is also tolerant of dry soils
Propagate by seed or hardwood cuttings
Suggested planting locations and garden types
Coastal Cottage & Informal Garden Wildlife Gardens
Pruning Pruning group 1 between leaf fall and midwinter
Pests May be affected by alder sucker, alder leaf beetle and leaf-mining sawflies
Susceptible to Phytophthora
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
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.