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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.

Sand is a common sublayer for hardscape features like driveways, paver patios, and more. Most projects that involve sand require a 1-inch layer to promote evenness, drainage, and weight distribution. For further drainage, most projects have a 6-inch minimum layer of gravel beneath the sand. 

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. 

First, dig a hole that’s the same depth as the root ball and wide enough for the roots to spread out fully. Before placing the tree in the hole, pour water in to help get rid of any air pockets in the soil.

When filling the hole back in, opt for a 1:1 ratio of organic compost with the soil left over from the ground. Do not use potting soil, fertilizer, or chemicals of any kind, as these can stress out and kill your newly planted tree.