Mulching around plants is one way to reduce the amount of moisture lost from the soil through evaporation. Mulching also suppresses weeds, which consume valuable moisture supplies. There are two main types of mulches available - organic and inorganic
Organic mulches include wood chips, shredded bark, pine needles, straw and peat moss are examples of organic mulches. Other material such as peanut, buckwheat, and cottonseed hulls are available in limited areas. Cost, appearance, durability, and local availability are all considerations when selecting organic mulch. Avoid materials that tend to mat and then repel water. At the other extreme, some mulch absorbs too much water and prevents it from reaching the soil. These should be avoided as well
Appropriate depth of mulch varies, but the following guidelines should be helpful. Mulch trees and shrubs to a depth of 3-4 inches and mulch herbaceous plants to a depth of 2-3 inches.
For more information on mulches check out these publications:
Inorganic Mulches, often of stone or plastics, tend to stay in place, do not rob the soil of nitrogen, and do not harbor weed seeds. However, they have numerous disadvantages when used in the garden.
The publication, Using Mulches in Managed Landscapes, also covers inorganic mulches.
Return to menu