How to Get Rid of Grubs in Your Lawn (Naturally, and for Good)
Beneficial nematodes, milky spore, and the simple soak test that tells you if you actually have a grub problem worth treating.
First, confirm you actually have grubs
Lawns can have a few grubs and be perfectly healthy. The threshold for treatment is 10+ grubs per square foot. Below that, the natural ecosystem handles it.
Cut three sides of a 12x12-inch square, peel back the turf, and count the white C-shaped larvae in the top 2 inches of soil.
Beneficial nematodes: the natural nuke
Heterorhabditis bacteriophora (Hb) nematodes hunt grubs in the soil and kill them within 48 hours. They're harmless to pets, kids, plants, and earthworms.
Buy them refrigerated, apply at dusk (UV kills them), and water heavily before and after. Expect 70–90% grub reduction within 2 weeks.
Frequently asked
What's the natural enemy of lawn grubs?+
Beneficial nematodes (microscopic worms), milky spore bacteria, birds, and predatory ground beetles all kill grubs without chemicals.
How do I know if I have grubs?+
Pull back a square foot of turf. If you find more than 10 white C-shaped grubs, you have an infestation. Other signs: spongy lawn, brown patches that lift like carpet, and animals digging at night.
When should I apply nematodes?+
Late August to early September, when grubs are young and feeding near the surface. Apply at dusk, after watering, and water again immediately.