plantStation
Excellent!
A collection of 70 models, containing over 100 separate trees and shrubs. It comprises both conifers and deciduous (with seasonal variation). This collection is designed with SketchUp in mind and are thus not only low poly but also try to avoid too much intersection of transparent image files for the foliage, as this can produce an unsightly ghosting effect in native SketchUp output. The thumbnail images provide a comprehensive list of both the named and generic tree types.