Horticulture is Dirr(ty) work

If you tell someone you found it in “Dirr” they’ll know you mean the Manual of Woody Landscape Plants: Their Identification, Ornamental Characteristics, Culture, Propagation and Uses (now in its 6th edition). But Michael A. Dirr, PhD has also written The Book on viburnums (Viburnums: Flowering Shrubs for Every Season), The Book on hydrangeas (Hydrangeas […]