Lorna, Here is a pic of my hosta, which hasn't a mark on it. It is on granite chippings and right beside our pond where we have lots of frogs. It was a bit vulnerable when it was small, but I don't have any problems with it now. It might look a bit patchy but that is because I have just watered the hanging basket which is above it, so it has a bit of water on the leaves - otherwise it's perfect! :) busy_lizzie