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You should add 1 to 4 inches of mulch, depending on your garden type and needs. Keep in mind that no amount of mulch can completely prevent weeds, but a heavier coverage (closer to 4 inches) can suppress weeds enough that you are only seeing them sprout every few weeks. Finer mulch prevents weeds more effectively than large mulch, so if you’re using mulched leaves or shredded bark, 1 to 2 inches will likely suffice, while 3 to 4 inches is best for larger mulch, like bark chips or straw.

If you have a lot of trees around your home, mulching all those leaves can smother the lawn. Air and light won't reach the grass and soil if too many leaves have been mulched. Turf grass and other lawn problems can arise if the weather is too wet and excessive leaves have been mulched.

Landscape boulders, especially porous stones like sandstone or granite, can crack or break over time. Cracks occur when water seeps into the surface of the stone and freezes. The risk is highest when it rains during the day and temperatures freeze overnight since the moisture has time to penetrate deeper into the rock before expanding.

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.