okay so it is not a good idea to start shooting squirrels. Leave that the those folk in the US of A. It's big over there, as are the guns. I too have watched as playful squigs have ruined flower beds and smashed pot after pot. So tie pots down, fasten them with wire if they're on a ledge. As for digging up the beds to bury their nuts!, put slate chippings down. This even works in pots as well. They will have a real good go at trying to get under the slates, which is bloody funny to watch, but they'll give up sooner or later. I had a damn great fox digging up my beds and i put in those very slim green wooden sticks that you can buy in the garden centre to secure stems to. Put them throughout the foliage and it really gets their goat. They just go elsewhere.