Speckled alder (Alnus rugosa) grows in sandy bottomland woods, along streamsides and seeps throughout northeast Iowa.
Hardiness: Zones 3 through 6
Growth Rate: Fast
Mature Shape: Small, thicket forming tree, with an open crown
Height: 25-50 feet
Width: 25-35 feet
Site Requirements: Full sun to partial shade, wide range of soil
Flowering Dates: March - May
Seed Dispersal Dates: September - October
Seed Bearing Age: 5-10 years
Seed Bearing Frequency: Yearly
Seed Stratification: No stratification period is needed.