Soil Clumps on Lawn

Question

My zoysia lawn, which I’ve maintained weed-free, is showing several spots of small soil clumps. What is causing this and how do I stop it?

Answer 1

This could be anything from an issue with grubworms (if these clumps are dry in nature) or you could have worm mounds (if moist in nature), which are a result of earthworms--actually a good thing.

Here is more information: https://www.gardeningknowhow.com/lawn-care/lgen/worm-casting-mounds.htm
https://www.gardeningknowhow.com/plant-problems/pests/lawn-grubs-how-to-get-rid-of-grub-worms.htm