Q: something has eaten into my hosta plants. they are planted in both sun and shade. How can I find the culprit and treat it?
You have slugs. They feed at night. Use an iron phosphate product such as Sluggo one made by Bonide or Bayer according to package directions. I use it twice this fall and begin again in spring when the hosta first emerge from the soil. This is not a silver bullet so plan to treat every two or three weeks until you see no more holes. Best And Happy Yardening, Nancy