Dramatic hostas (Hosta spp.) add vivid green color and bold texture to your yard. These versatile perennials grow in U.S. Department of Agriculture plant hardiness zones 4a through 9a in shady, partially shady or partially sunny areas. Though fairly easy to grow, hosta plants do sometimes fall victim to certain insects and other pests. For example, earwigs and cutworms can nibble holes in the leaves of your hostas. Insecticides aren't a good choice for hosta pests; cultural controls are usually the most effective.
Fill clean, empty shallow tin cans with a 1/2-inch layer of vegetable oil.
Add a drop or two of bacon grease to the vegetable oil.
Bury the cans in the soil around the hostas so the rims of the cans are even with the surface of the ground.
Check the traps regularly, dump out the oil and earwigs inside, refill the cans and place them back in their spots around the hostas.
Kick Cutworms to the Curb
Take a flashlight outside after dark and carefully check your hosta plants for cutworms, which are 1- to 2-inch-long, brown caterpillarlike pests. Check under each hosta leaf, as well, as cutworms aren't picky about which side of the leaf they're eating.
Pluck each cutworm that you find off the leaves of your plants using your fingers. Wear gloves if you prefer.
Put the cutworms in a plastic bag and throw them in the trash so the pests can't make their way back to your hostas.
Nix the Nematodes
Place a layer of peat, manure or compost on the soil surrounding your hostas. These natural ingredients increase the moisture level around your plants, which is effective because nematodes tend to target plants that haven't been getting enough water.
Mix the peat, manure or compost into the soil, using a trowel to dig underneath the existing soil and turning it to mix the new materials in.
Water the area around your hostas well to further incorporate the peat, manure or compost into the soil.
Stop the Snails and Slugs
Place overturned flower pots or pieces of board in the area where your hosta plants are growing.
Check underneath the flower pots or boards each day for slugs or snails. Remove any pests you find. Wear gloves if you wish.
Put the snails or slugs in plastic bags and throw them in the trash so they don't return to your plants.