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While they’re popular and have a lot of pros, the cons of river rocks include the following:

• River rocks don’t break down or provide nutrients to plants. 

• These stones can get hot and scorch nearby plants. 

• River stones may heat the surrounding soil to inhospitable temperatures. 

• Rocks can block rainwater from seeping into the ground if installations are too thick or tightly packed.

Most downsides occur when using river rock as mulch in gardens and flower beds. However, you can still incorporate river rocks into your landscape as long as you use them in the correct ways.

You shouldn’t put topsoil over new grass seed. Even though it may seem like this would increase soil contact and help the seeds grow, adding more soil overtop of planted grass seed will only make it harder for water and oxygen to reach the grass seeds. If you want to protect the grass seeds, consider adding a thin layer of organic matter, such as straw or hay.

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.

Mulch is best used in garden beds and yards, not in your driveway as pothole filler. It is meant to stimulate plant growth. Upon repeated pressure, it turns into compost, which also serves as fertilizer for weeds to take over. The roots will then break into your driveway, leading to more material loss and structural collapses.