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How tall your mulch should be around your tree depends on the type of mulch you use, but aim for 3 to 4 inches as a rule of thumb. You’ll want to avoid simply piling it up in hopes of offering additional benefits to your tree. Volcano mulching is the infamous term for piling way too much mulch against the stem of your tree. This could actually kill your tree or severely harm it, as your tree trunk needs space to breathe without too much moisture.

Depending on the size of the river rock and the density of your soil, add woven landscape fabric or sand under river rock. The extra layer will ensure your river rock sits evenly and doesn't create puddles or uneven areas throughout the design. In some cases, nothing is necessary beneath river rock, but be sure to speak with a landscaper to keep your landscaping looking sharp.

Before you put down grass seed, you should cultivate your soil or add two inches of topsoil. You should also put down fertilizer at the same time as your seed to prompt healthy growth. Be sure to water after you put down grass seed, especially for the first two weeks.

Mulch costs anywhere from $30 to $150 per cubic yard, depending on the type you choose. On the inexpensive end, red and black mulch are about $35 to $40 per cubic yard, and are typically made from recycled waste wood like shredded old pallets or deck material. Cedar, cypress, and rubber mulch cost anywhere from $100 to $120 per cubic yard. A pro can help you determine the type of mulch most suitable for your landscaping needs.