In early spring, an aspen clone will produce small ... The ability of aspen to produce whole stands of "trees" vegetatively provides yet another key element in explaining the species’ ability ...

Aspen is invariably the last tree to get its new leaves in spring, with them often not opening fully until early June in the Highlands, and it loses them in late September or early October ...

What was going on? Meanwhile biologists Bill Ripple and Eric Larsen were probing into another mystery – the disappearance of aspen trees in the park. At first they considered climate change.