Dave Hill writes

I wouldn't bother if I were you.
The squirrel planted them and you can be sure that his/her decendants
will have every nut the bushes ever produce.

We've only got a couple of squirrels - I get a good share of the ones on
the contorted hazel.

In an urban environment, squirrels are not the problem that they are in
a more rural environment.
--
Kay