Trees and shrubs bring permanence and structure to home landscapes, adding character and beauty to the entire property. They can impart an immediate sense of geography; act as background staging for flower gardens, outdoor living spaces, and children’s play areas; and provide cool shadows and privacy from neighbors and passers-by. They are essential to every beautiful yard, yet many homeowners do not give them the attention that flowers and lawns traditionally receive. Penny O’Sullivan gives trees and shrubs the respect they deserve in her lively, comprehensive book, The Homeowner’s Complete Tree & Shrub Handbook. Woody plants, she maintains, can be the heart and soul of the home landscape plan. Their contribution to the yard might include a springtime canopy of blossoms; colorful, delicious summer fruit; a regal year-round silhouette; rough and rugged bark; or seasonally changing foliage. Their presence is a soothing anchor in the ever-changing environment of a typical...