Hydrangeas are one of the most popular flowering shrubs in the world. With many species native to North America and dozens of hardy hybrids developed over the years, there is an overwhelming range of plants to choose from. Here is practical, expert advice for the American gardener looking to add brilliant color and show-stopping blooms to a garden. This comprehensive guide covers the early history of hydrangeas, wild species and cultivated forms -- including many North American species and American-bred hybrids -- and lists the most popular varieties. It also