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There are a number of good books available. The best and most up-to-date book comes very recently from Dr. Michael A. Dirr, Hydrangeas for American Gardens. It applies his 30-plus years of horticultural knowledge to the genus Hydrangea in a very readable, opinionated & often humorous style. It builds on and acknowledges earlier works including Hydrangeas, A Gardeners' Guide, by Toni Lawson-Hall and Brian Rothera, 1995; and Hydrangeas, by Glyn Church, 1999.