UCCE Master Gardeners of Orange County
University of California
UCCE Master Gardeners of Orange County

Soil Management

Mulch, how often to add

Mulch slowly decomposes over time, and new mulch is needed to fill in gaps and build the mulch layer back up to about 2 to 4 inches. It is generally recommended that fresh mulch be added on about a yearly basis.

When adding new mulch, it is best to leave the existing mulch in place and add the new mulch to the top. Mulch decomposes over time and adds to the fertility of the soil.

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