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Replace organic mulch every one to two years, depending on the variety. Wood chips and straw, for example, will last a couple of years, while grass clippings and pine needles need replacing every several months. Inorganic mulch—such as rock and rubber chips—can stay in place for up to four years, depending on erosion and general garden upkeep. 

You shouldn’t put topsoil over new grass seed. Even though it may seem like this would increase soil contact and help the seeds grow, adding more soil overtop of planted grass seed will only make it harder for water and oxygen to reach the grass seeds. If you want to protect the grass seeds, consider adding a thin layer of organic matter, such as straw or hay.

The best mulches for trees are wood chips, bark nuggets, or pine straw. Depending on your goals, you may want to avoid using plastic, stone, rubber, or wet grass clippings. Plastic mulch prevents water from reaching the mulched areas of your tree, stones don’t offer any nutritional benefits to the soil, rubber can release byproducts into the soil when it decomposes, and wet grass clippings can lead to rot. 

Plastic may prove beneficial in cold climates in the winter, but wood chips are the ideal option for most environments.

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.