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Weeds can grow through rubber mulch, but it depends on if you removed all the weeds in your garden beforehand. Weeds already in the soil can grow even when using rubber mulch. However, that doesn’t mean that your garden will be littered with rubber and weeds, but it does mean that the occasional weed might still pop up. Another way you can increase your weed suppression is by using landscape fabric as a second layer. 

While organic mulch offers many benefits, it can also attract bugs looking for shelter, food, and water. Insects, rodents, snails, and slugs are often attracted to its decomposing material.

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.

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.