Gardeners Warned: Rubber Mulch Poses Toxic Threat to Soil and Health

As of September 27th, 2025, homeowners with children are being cautioned against using rubber mulch made from recycled tires as a ground cover for their playgrounds and gardens. While rubber mulch may seem like a soft and long-lasting option, it is now known to be a significant pollution risk.

A recent discussion in the Chicago Gardeners Club Facebook group highlighted the growing concerns around rubber mulch. One gardener inquired about its benefits, but commenters quickly steered them away, warning that the material can leak toxic chemicals into the soil, damaging agriculture, micro- and macro-organisms, and even human health. Additionally, rubber mulch is highly flammable and difficult to remove, requiring "heavy digging" according to one commenter.

In contrast, experts recommend more environmentally friendly ground covers like sawdust and natural grasses such as buffalo grass or clover. These options are low-maintenance, require little water or money to maintain, and promote biodiversity by attracting pollinators that are crucial for the human food supply.

The Facebook discussion has prompted the original poster to reconsider their plans, with the commenter stating, "Rubber mulch sounds good on paper, but it's kinda a bad idea all around. It's made from tires, so it leaches chemicals and heavy metals into the soil. It's pollution. I appreciate the insights. Rubber mulch will be a no for me."