Grubs are one of those worms you never want to see too many of in your garden because they have a tendency to eat the roots of grass, garden plants, and ornamental flowers. While a few grub worms in your yard is normal, if you start finding around 10 grubs or more per square foot then you may have an infestation on your hands and your yard is likely to suffer for it. Advertisement Luckily, there are a few ways to get rid of these gross-looking critters.