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Forest economics: Why are fallen alder leaves still green?

Most of the leaves on the ground are brown, yellow, or other fall colors. Why are many alder leaves still green?

After Snowpocalypse, how are the trees doing?

Here in the Pacific NW, we had an uncommonly cold and snowy February. Did this affect the new buds on trees and shrubs?

Maple seeds: nature's helicopters

This is the season that winged seeds of maple trees helicopter down to the ground. What advantage do the whirling seeds provide to maple trees?