Slime mold is not considered harmful to humans, but unfortunately the same can't be said for how it can affect trees, shrubs and flowering plants. Trees and other plants are constantly seeking new sources of water and nutrition as they grow, sending out very fine fibrous strands until they find what they want, then they thicken up to become the conduit for what they need to keep growing. 

In one particular community located around a golf course, where maintaining a good aesthetic appearance was compulsory, they spent over $2 million over a two year period replacing dead or dying trees, shrubs and flowering plants. They couldn't figure out what was going on, so they brought in a horticulture specialist, and they didn't like what he reported was the cause of all of this. It turns out the wood mulch the community was using was attracting slime mold, which was attacking the fine root "feelers" and effectively slowly killing the very trees, shrubs and flowering plants they purchased and spread the wood mulch out to preserve and protect. 

The founder of this company was astonished when he learned of this, firsthand, on site, and the solution was simple. Rubber mulch. They have never had the problem again.

Rubber mulch can't absorb moisture, so it can't freeze or become a "hot mulch" like wood, and doesn't attract microbes, pests, rodents or critters. It retains moisture and maintains soil temperature better than any other form of mulch. Rubber mulch doesn't blow away in the wind or wash out in the heavy rain or stormwater run-off, it lasts 25 years or more, and leaves and debris are easily blown out of it without disturbing it. Sounds like US Rubber Mulch is the right choice!