Originally Posted by Gerania
Yes, people use lava rock and expanded shale to deter the little pests. I planted some bulbs in the yard last fall and mixed in the shale. Hopefully it'll work. It's also used to lighten up heavy soil.
If you're having a hard time digging, it sounds as though they used a lot!
Thanks Gerania. Yes, in Raleigh, NC we do have heavy clay soil. At first I thought perhaps the previous homeowner had used lava rock as a decorative mulch and just missed some when they switched to wood but then I noticed the rock is only where the bulb plants are. I've got a vole problem but they don't go near the bulbs.
Many of the Iris and daylilies are overgrown and I'm thinking of dividing them and tossing in some rock when I move them.