My mother has monkey grass along the side of her driveway and carport and it is being taken over by lots of red dirt mounds that are flat and spread out. New ones have a granular sandy texture that seemed to have lots of tiny holes. But when we dig into the mounds there is nothing there. We are split among neighbors and other experts as to whether these are caused by moles or ants.
Is It a Mole Problem or Insect Mounds?
Certified GKH Gardening Expert
It sounds more like ant mounds to me as moles generally tunnel through the ground. For help with controlling the ants, these articles should help: https://www.gardeningknowhow.com/plant-problems/pests/keeping-ants-of-flowering-vines-vegetables-and-flowers.htm