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A light layer of mulch can help protect a tree, retain moisture, and keep the soil healthy. However, it’s important to avoid over-mulching or piling the mulch up around the trunk of a tree, a practice notoriously called “volcano mulching.” That piled mulch can increase the chances of rot and disease on the tree trunk as well as overwhelming the soil, which needs access to a certain amount of air. Topped trees have it hard enough: mulch sparingly while they heal.

Mulch costs anywhere from $30 to $150 per cubic yard, depending on several factors. On the lower end, common types like red and black mulch cost about $35 to $40 per cubic yard and are often made from recycled wood. More premium options like cedar, cypress, and rubber mulch can cost between $100 and $120 per cubic yard. The total cost is also influenced by delivery, which can be around $75 per cubic yard, though many companies provide a free estimate. It is generally cheaper to buy mulch in bulk and have it delivered, but buying it in bags may be more cost-effective for smaller areas. Other factors like the quantity you need, time of year, your geographical location, and professional installation will also affect the final price. Before getting quotes, it's a good idea to calculate how much mulch you need. A professional can help you determine the most suitable type for your landscaping needs.

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.

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.