Scientists are investigating the reasons some plants still wear last season’s tattered clothes.

On a February day, it may seem as if all the trees and shrubs — except for the evergreens or conifers — are leafless. But a walk in the neighborhood, or a local natural area, will reveal that’s not ...

Chilopsis linearis, the desert willow or desert catalpa, is prized in dry gardens for its showy, fragrant blossoms which cover the tree in summer. When many native bloomers are past their spring glory ...