Greer’s Guidebook to Available Rhododendrons, Harold E. Greer, 1988.
This revised edition features more than 2,000 rhododendrons, hybrids, and species are detailed including plant parentage, hardiness, and size. Advice on planting, care, disease, pests, and propagation is also covered. Marvelous new color photographs of 450 rhododendrons. Great for beginners!