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Pea gravel can retain some heat, but it generally stays cooler than materials like concrete, asphalt, or stone pavers. Lighter-colored pea gravel reflects more sunlight and tends to stay cooler, while darker-colored gravel can absorb heat and become warmer to the touch.

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.

Small gravel is the better option since it creates a stable, even surface that’s easier on paws and hooves. Large gravel can be uncomfortable and may shift too much underfoot. So if you’re using gravel in pet or livestock areas, go for smooth, rounded small gravel to prevent injuries and discomfort.

Landscape boulders, especially porous stones like sandstone or granite, can crack or break over time. Cracks occur when water seeps into the surface of the stone and freezes. The risk is highest when it rains during the day and temperatures freeze overnight since the moisture has time to penetrate deeper into the rock before expanding.