I was blaming the goldfish, but I caught two different eastern box turtles in the pond recently--no wonder the hyacinths and lilies keep disappearing! grrrr...is there a such thing as one that they don't like?
Found the following info. Not sure how much it helps you :-). In the wild eastern box turtles are opportunistic omnivores and will feed on a variety of animal and vegetable matter. There are a variety of foods which are universally accepted by eastern box turtles, which include earthworms, snails, slugs, grubs, beetles, caterpillars, grasses, fallen fruit, berries, mushrooms, flowers, bread, duck weed, and carrion. Studies at Jug Bay Wetlands Sanctuary in Maryland have also shown that eastern box turtles have fed on live birds that were trapped in netting
Perhaps you could try leaving out some greens for them they might like better than your plants, like romaine lettuce, for example. Short of relocating them I don't see that you have too many choices, unless you just let them eat what they like 'till it's gone and then they'll go too, in search of better pickings.