Organic mulches add nutrients to the soil and supply organic matter. They can reduce soil compaction and encourage the presence of beneficial organisms. Popular organic choices are woodchips and leaves. Be sure that the leaves have aged at least six months. Natural chemicals can leach from decaying leaves and harm your new plants.
Unchopped leaves can mat and block essential air and water from entering the soil.
Some tree trimming companies and utilities will deliver a load of woodchips and leaves to your home for no charge. There are several varieties to choose from. Cocoa bean shells have a delightful scent and a pleasing dark color. Pine is usually a lower cost option. Cedar and cypress tend to decompose slower than other organic mulches.