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Common Alder

Botanical Name
Alnus glutinosa
Hardiness
Zones 4 to 7
Height
40 to 60 feet
Width
20 to 40 feet
Flowers
Male catkins, female purplish egg shaped strobile
Fruit
Winged nutlet borne on egg-shaped woody strobile, persistent
Light
Full sun to part shade
Soil
Moist to wet
Planting & Care
  • Transplants easily in spring
  • Good tree for reclamation sites
  • Fixes own nitrogen
Problems
Wooly alder aphid, tent caterpillar, can become invasive
Varieties
  • Laciniata - dissected leaves
  • Pyramidalis - upright, narrow spread, good disease resistance

Upcoming Appearances
 

February 7-9, 2020
PBS Wisconsin's
Garden & Landscape Expo 

Madison, WI
 

February 14 & 15 , 2020
Milwaukee NARI Spring Home Improvement Show
West Allis, WI


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