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Wood from black walnut, magnolia, eucalyptus, red maple, and invasive species like tree of heaven are not recommended for mulching. These trees release allelochemicals that can suppress plant growth. Some homeowners, however, use wood from these trees for mulching if it is less potent due to age or concentration, or if the plants are not as sensitive to them.

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.

Yes, rotting leaves can be good for your soil. The decaying leaves release nutrients into the soil that can boost the health of your plants, and the organic matter also helps improve airflow and water drainage.

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.