Note however, that it has to be applied immediately after planting. Chemicals cannot be expected to control all weed growth without severely affecting the trees. Whenever chemicals are used, rates must be followed and all necessary safety precautions taken. Non Chemical Weed Control Non-chemical methods of weed control may also be considered. The use of mulches to prevent weed growth around trees is becoming a popular option.
Mulches can be organic or plastic and each have their relative advantages.
The organic mulches consist of products such as wood chips, sawdust, flax shives or straw. Organic mulches have the advantage of being inexpensive, but may cause nitrogen deficiency that may have to be addressed by fertilizer. Organic mulches also tend to keep soil temperatures lower, although this is not generally a problem. Finally, proper selection of organic mulches will minimize rodent damage to the tree planting. Plastic mulches, help conserve moisture and provide longer lasting control of weeds around shelterbelt trees.