Generally, it is not necessary to remove old mulch before applying a new layer. As organic mulch breaks down, it enriches the soil with nutrients. However, you should remove the old layer if it shows signs of fungus or disease, which can be common in moist areas, or if the total depth is already too thick. Avoid letting the total mulch depth exceed 3 inches, as this can harm plant roots. If you do remove old, disease-free mulch, it can be added to a compost pile.

If you don’t have too many fallen leaves, one option is to leave them in place. They’ll eventually decompose, adding vital nutrients to the soil. But if you have a thick layer of leaves smothering your lawn, you’ll want to either mulch them or bag them up for removal. If you choose to collect and bag your leaves, check with your local municipality on any specific guidelines to dispose of them. Many cities offer curbside pickup if the leaves are disposed of in yard waste bags or containers. 

Leaf removal isn’t always necessary, and what you should do with leaves in your yard depends on the number of trees you have. Leaving a small amount of leaves to decompose on your property can add nutrients to the soil and help grass, plants, and trees thrive. However, large accumulations of leaves can promote mold and fungal growth, so you should do at least two fall cleanups if you have many trees on your property.

Wood is a very versatile material, so you can either compost it, use it for firewood, turn it into wood chips, or save it for future projects. If you don’t want excess wood cluttering your garage or workspace, you can call local community centers or schools to see if they have a need for it.