Landscaped sites are often seeded with vigorous varieties ot grass and legume species, which, while reducing soil erosion and giving an attractive green appearance, may kill young trees or check their growth. Weeds compete with trees for moisture, nutrients and light; but they can also interfere by releasing toxins, modifying soil and air temperatures, and harbouring pests. Only when these processes are understood can appropriate weeding methods be selected. Trees and Weeds therefore begins with a detailed examination of the different ways in which weeds can influence young trees. The Handbook goes on to guide the forester through the various methods of weed control possible – mowing, cultivation, herbicides, mulching and alternative ground-cover species. This Handbook is no longer available in hardcopy.