Botanical Name: Alnus rhombifolia
Common Name: White alder
Type of Plant: dicot: tree
Character deciduous
 
Habit of Growth:
Overall Shape a very erect, large, single trunked plant (occasionally will develop 2-3 leaders) with ascending branches forming a pyramidal canopy that becomes rounded with age; the trunk is grayish white, with A-shaped scars
Height 40-80'(100')
Spread 1/3-2/3
Growth Rate very rapid
 
Environment:
Exposure outdoor full or partial sun; can tolerate shade at inland locations
Soil prefers moist habitats with good drainage
Hardiness hardy (zones 1-9, 14-21); thrives with seasonal climates
 
Morphology:
Leaves pinnate, alternate, oval to somewhat rhombic, 2-4" long, finely serrate; dark green above; pale beneath, petioles are 1-1-1/2" long
Flowers tiny, in catkins: the male catkins are cylindrical, 3/4" to 1" long, mostly terminal; female catkins are oval, 1/2" long, axillary
Fruit a nutlet: flat, tiny, borne between scales of female 'cone'
 
Propagation:
seed
 
Usage:
a widely used large-scale vertical accent or shade tree, tolerant of lawn watering; groves, has shallow aggressive root system; suitable for rustic, woodsy, temperate-climate theme landscapes
 
Landscape Care:
Watering regular; thrives with heavy watering-not drought tolerant
Fertilizing balanced, plus iron, in locations where drainage is poor
Pruning head high when young, otherwise leave alone
Pests/Diseases relatively free; tent caterpillars in native habitat
Special Conditions/Other Mountains of
 
Origin: California/Washington
Family: Betulaceae

Notes:
 
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