How-To for Rammed Earth

by American Forests (P.O. Box 2000, Washington, DC 20013) and Home Builder Press of the National Association of Home Builders (1201 15th Street NW, Washington, DC 20005), 1995. 120 pages; paperback $12.

This concise book argues that trees are good—both environmentally and from a business standpoint—and then presents information on how to protect existing trees and incorporate trees into development plans. Many benefits of trees are described, including how they reduce energy use, mitigate pollutants, control erosion, and enhance homeowners’ psychological well-being.

The book presents various surveys that show how trees increase property value and make homes more salable. In a survey of 1,350 Realtors by Bank America Mortgage, for example, “84% felt that a home with trees would be as much as 20% more salable than a home without trees.” Realtor C. P. Morgan of Indiana says in the book that wooded lots “sell for an average of 20% more than similarly sized nonwooded lots,” with a few nice trees adding $10,000 to $15,000 to the base price of a $60,000 lot. In some cases, according to the book, saving trees can save money, and the builder’s or developer’s image can usually be enhanced.

A brief review of tree physiology helps the reader understand the basis of various recommendations on tree care. Tree roots are close to the surface and require oxygen for respiration—which is why changing the grade or compacting soil around trees can be so destructive. The layers of phloem, xylem, and cambium near the outer surface of the truck are where most growth takes place, so protection against abrasion and other damage is critically important. Tree trunks are susceptible to fungi, so the trunk flare should not be covered with soil or mulch. Potential construction damage to trees is described, and recommendations are offered to help builders minimize damage. Finally, the role of trees in planning and development is discussed, with recommendations on carrying out detailed tree and soil inventories, and incorporating tree-protection measures into master plans.

The book’s organization is a little odd, jumping around between planning issues and practical planting and protection measures, but you’ll find lots of good information packed into this small book.