Authoritative, encyclopedic, lavishly illustrated guide to the trees of the state and region—from the Morris Arboretum, the official arboretum of the Commonwe
The second edition of The Plants of Pennsylvania is the authoritative guide to identifying the nearly 3,400 species of flowering plants, ferns, and gymnosperms
Ralph Waldo Emerson defined a weed as a plant whose virtues have not yet been discovered. To the wild-plant enthusiast who has discovered the virtues of many pl
Trees are our allies in maintaining a healthy planet. Partnering with trees allows us to build soil, enhance biodiversity, increase wildlife populations, grow f