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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.
© RHS 2002
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Other common names
common alder aar
aller black alder European alder
Alnus are vigorous deciduous trees and large shrubs with rounded leaves and often conspicuous catkins in winter
A. glutinosa is a deciduous tree to 25m, broadly conical in habit when young, with grey-purple buds and young catkins conspicuous in winter, and rounded bright green leaves
Europe to N Africa
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
Aspect South-facing or North-facing or West-facing or East-facing
Exposure Exposed or Sheltered
MoistureMoist but well-drained, Poorly-drained
SoilLoam, Chalk, Clay
pHAcid, Alkaline, Neutral
Higher than 12 metres
Time to ultimate height
This genus is noted for its ability to thrive in poor, wet conditions and is widely used in land reclamation
Propagate by seed or hardwood cuttings
Suggested planting locations and garden types
Low Maintenance Hedging & Screens
Wildflower meadow Wildlife Gardens Coastal
Pruning Pruning group 1
Pests Can get alder sucker and leaf-mining sawflies
Susceptible to Phytophthora
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.
Join the RHS today and get 12 months for the price of 9