Woke up to find this bright yellow, frothy patch on my mulch. It appeared overnight and looks like expanding foam. Any ideas?

often the best course of action.

For those who prefer intervention, natural treatments such as increasing sunlight exposure and improving garden airflow can be effective. Changing the type of mulch to one that dries out more quickly, like pine needles, can also help.

Chemical treatments are generally unnecessary and not recommended for slime mold, as they are not fungi and do not respond to fungicides. Instead, focusing on environmental controls and physical removal will yield better results.