Shysal What a gorgeous shed!! I have several hostas, some are in the borders. For years I've treated them with a garlic infusion in the afternoons. To make the infusion, boil a whole head of garlic in a large pan of water until the garlic is very soft. Allow to go cold then mash and strain. Pour into two 1 ltr milk bottles. Dilute a couple of tablespoons in a full watering can. Using the spray head on the watering can water the hosta leaves. This has to be done in the afternoon. It works for me and I saw a hosta grower on Gardeners' World last year who uses the same thing, on a large scale.