How would the pot be bolted to the slab? I assume the slab will sit flush on the ground and wasn't sure where we would lose the head of the bolt or nut. Keen to resolve this as its becoming a daily ritual to pick these pots up and the spilled compost!If you're dead set on that shape of pot, small paving slab, fix through bottom of pot into slab, per other suggestions. You'll be able to move it around still but it'll be pretty heavy [and could easily rip the bottom off the pot if you're not careful moving it, I suppose]. I don't mean some plain old concrete slab, I mean something a little bit fancy so it looks nice.