Zone 1 is deemed inhospitable for most trees. Its bone-chilling temperatures can plunge to -60 degrees Fahrenheit, while the icy winds cause branch die-back. However, quaking aspen (Populus ...

Quaking aspens store chlorophyll beneath their bark (particularly in younger trees), this is what gives the trunk a greenish cast. This helps them to continue to produce sugars, at least when the days ...

Admirers frequently note the striking white bark of quaking aspen. This bark lives and carries out photosynthesis, attributes that make it unique among North American trees and likely contribute ...