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The best size rock for your landscaping depends on the design, as different boulders serve different purposes. If you want to group boulders to create a natural-looking cluster, you’ll need a range of sizes. Otherwise, here are some suggestions:

• Small boulders (smaller than 12 inches across): Best for landscape edging and fire pits 

• Medium boulders (12–24 inches): Best for retaining walls and water features

• Large boulders (more than 24 inches): Best as standalone landscaping features, steps, or walkways.

Of course, you can mix and match sizes to create a unique display.

Regular maintenance involves raking or leveling out any displaced gravel, filling in low spots, and adding fresh gravel as needed to help prevent potholes and ruts. If you live in an area with heavy rain, checking the drainage and reinforcing the edges periodically can help prevent erosion.

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. 

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.