I think I need to allow some excavation-space... maybe will use one bed for something like salad leaves that I'm really not that bothered about if they all get hoicked up, and let L play with that.

I am going to have to do something to protect that autumn olive -- I think it's really the only vulnerable thing that I'm at all bothered about. The other more precious things (i.e. harder to replace, or taking years to grow back) are all things like trees and bushes which are pretty robust. I think I would likely notice if he was digging up the apple tree...