alder
Alnus sieboldiana
USDA zones6 to 10
SunHandles full sun to partial sun
WaterNeeds moderate soil
Size10 to 30 feet tall10 to 30 feet wide
- Bloom season
- Spring, summer
- Bloom color
- Female catkins mature from red to green, male catkins are pale yellowish-green
Garden uses
Notes
Alder (Alnus sieboldiana) is a tree for hedges and naturalized areas. It is hardy to USDA zone 6, or down to -10°F (-23°C). This plant likes full or part sun and average moisture. Male catkins are pale yellowish-green, and female catkins mature from red to green. It blooms from early to late spring and into early summer. It can reach 10 to 30 feet tall and wide, so give it room.
Pairs well with White mulberry, Lenten rose, and Fountain grass.
Native range
Japan.