Alnus glutinosa

Common Alder

Alnus glutinosa, the Common Alder, is a large deciduous tree known for its rounded bright green leaves and catkins that appear in late winter. Broadly conical in shape, it is ideal for naturalised planting, hedging, and wet soils. It offers excellent wildlife value, supporting pollinators and birds. Hardy and low maintenance, it is a dependable choice for larger Irish gardens.

Flowering Months

Jan J

Feb F

Mar M

Apr A

May M

Jun J

Jul J

Aug A

Sep S

Oct O

Nov N

Dec D

Size

Max Height

12.0 m +

Max Spread

4.0 m — 8.0 m

Growth Habit

Tall, narrow growth habit with strongly vertical main stems.

Planting Position

Sunlight i Indicates how much direct sunlight the plant needs each day. Full sun means 6+ hours, part shade is filtered or morning sun, and full shade is little to no direct sun.

Full Sun

Aspect i Aspect refers to the direction the planting spot faces (north, south, east or west). It affects light levels, warmth and exposure.

North South East West

Exposure i Exposure describes how sheltered or exposed a plant’s position is, particularly to wind and weather.

Exposed / Sheltered

Hardiness i Hardiness indicates how well a plant tolerates cold conditions outdoors. Higher ratings generally mean greater frost tolerance.

(< −20 °C) Extremely hardy

Ideal Soil Conditions

Soil Type i Soil type describes the texture of the soil (clay, sand, loam, chalk). This affects drainage, nutrients and how roots grow.

Chalk Clay Loam

Soil Moisture i Soil moisture tells you how wet or dry the soil should be for best growth. Match this to your garden conditions for healthier plants.

Moist but permeable / Poorly-drained / Free draining

Soil pH i Soil pH measures how acidic or alkaline the soil is. It affects nutrient availability and can impact plant growth.

Acid Alkaline Neutral

Plant Uses & Merits

Uses

Coastal Areas
Hedging / Screening

Merits

Low Maintenance

Alnus glutinosa

Common Alder

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Alnus glutinosa

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