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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.

The best size river rock for your landscaping project depends on how you plan to use the stones. Generally, most river rocks used in landscaping are between 1/2 and 8 inches in diameter. For walkways and pathways, smaller rocks between 1 and 3 inches are suitable. For water features, medium-sized stones from 2 to 5 inches often work best. Garden beds can benefit from a mix of medium and large stones, ranging from 3 to 8 inches. These sizes can cover applications like decorative flower beds and drainage areas around foundations or retaining walls. For added visual interest, landscapers sometimes intersperse smaller river rocks with large boulders.

To prepare your yard for river rocks, smaller rocks may require laying landscape fabric to keep the stones from sinking into the ground while encouraging proper water drainage. You should also clear the land of weeds and larger boulders and, in some cases, test the density of the soil to ensure it can handle the weight.

Mulching any time of year can be beneficial, so you can choose based on your preference. Most homeowners avoid the winter and summer because of the uncomfortable temperatures, so spring and fall are often best. Try not to mulch right before heavy rainfall or a big storm is expected, as wind and runoff can move newly laid mulch around and make more work for you.