The answer to 'mulch overgrown' is that mulch can become overgrown and compacted over time, leading to poor drainage, weed growth, and unhealthy plants. Common causes include neglecting to replenish or refresh the mulch, heavy rainfall or irrigation, and letting the mulch build up too thick around plants.
Symptoms of overgrown mulch include water pooling on the surface, weeds and grass growing through the mulch, and plants that appear stressed or unhealthy. To fix this, you'll need to remove the excess mulch, loosen and aerate the soil, and apply a fresh layer of 2-4 inches of new mulch around plants. This is generally a DIY task, but for large areas or if you're unsure, it's best to consult a professional landscaper.