What can excessive mulching lead to in plant health?

Excessive mulching can indeed lead to root rot in plants. When too much mulch is applied, it can create an overly moist environment that prevents proper air circulation around the roots. This excess moisture can promote the growth of fungi and bacteria that thrive in damp conditions, which in turn can lead to plant diseases, including root rot. Furthermore, thick layers of mulch can insulate the soil, maintaining higher temperatures and sometimes leading to thermal stress on the roots. Proper mulching practices involve applying just the right amount of mulch to retain moisture and suppress weeds, while ensuring that root health is not compromised.