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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.

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.

Mulching any time of year can attract termites, so there’s no added risk in the fall. The important thing to remember is that termites are attracted to rotting wood, so you need to lay a thin enough layer that won’t trap too much moisture and lead to rotting. A layer between 1 and 4 inches thick should provide all the benefits you’re looking for without attracting termites.

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.