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...take away their spade
Having re-turfed the back garden last summer, I've spent a reasonable amount of time making sure any weeds that are present are dug out before spreading - have recently found 'stronger' ones that, on digging out, are sprouting from what look like almonds/hazelnuts.
Stood in the lounge yesterday I spotted one of two squirrels taking these in their mouth, scampering to the lawn, digging a hole, planting said nuts before patting down the earth...little f*cker!
Apart from the obvious, take away their spade