Alnus glutinosa
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 in an egg shaped strobile, ripens in October to November, woody strobile persists for a year -
Fall Color
Green to brown
Light
Full sun to part shade
Soil
Moist to wet
Planting and Care
Transplants easily in spring, good tree for reclamation sites, fixes own nitrogen
Problems
Wooly alder aphid, tent caterpillar, can become invasive
Varieties to Consider
'Laciniata' - dissected leaves
'Pyramidalis' - upright, narrow spread, good disease resistance
'Pyramidalis' - upright, narrow spread, good disease resistance