Category: deciduous tree Size: medium
Mature Size: 20 - 50' by 20 - 30'
Zone: To 2 Growth Rate: fast
Foliage: Green, turning to orange in fall.
Elevation (if known): 7,000' to 10,000'
Water: Simulate mountain conditions with moisture retentive mulch. Water around the entire drip line as these trees have shallow roots. High water needs.
Soil : Well drained, tolerates slight alkalinity
Comments: Aspens will sucker out to form colonies. Consider planting location. Make sure tree receives water all around, otherwise may blow over.
Warnings: Aspens are notorious for suckering. Female trees produce vast amounts of cottony seed; nurseries only sell males. Trees tend develop shallow roots, and tend to develop more diseases than their cottonwood relatives. May be short lived.
Alamosa Tree Board Recommended? yes
Street Tree? no Street Tree Conditions: Suckers cause problems with sidewalks.
CO/NM native? yes Native to: Colorado as well as other areas
Known Locations: Quiet a few around Alamosa, but not many good specimens.
Information Sources: Rky Mtn Gardener's Guide; Little Valley Whole Sales Nursery; Salida, CO, Tree Guide