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Nonorganic mulch, like river rocks, pebbles, or lava rock, technically lasts the longest. It helps with moisture retention and weed control but doesn’t break down and release nutrients like organic mulch. Wood mulch decomposes slowly, which can help it last longer than leaf or straw mulch, but it won’t provide as many nutrients as quickly as the faster decomposing types.

Food-grade diatomaceous earth is a natural product that comes from diatoms—fossilized aquatic organisms from tens of millions of years ago. Food-grade diatomaceous earth is considered "natural," while pool or filter-grade diatomaceous earth has been treated and transformed to have higher crystalline silica content.

The most important thing to put under a rock garden is the appropriate soil. The specific soil needed will depend on the type of plants you’re growing as well as the environment you live in. You can also put non-woven or woven fabric under the rocks to add to the garden's structural stability.

Pea gravel consists of many small, rounded stones that, unsurprisingly, kind of resemble peas. They range in size from 1/8 to 3/8 of an inch. Higher-end products might be a little more uniform and have fewer jagged rocks in the mix.