I'd try to get rid of it if I were you. It's not really a useful garden plant ... it was loved by gamekeepers as it suckers (and suckers and suckers), makes thick groundcover and pheasants like the berries. ... Not what I'd call decorative ...
It is tenacious .... you have been warned ...
I already have a few growing under trees in the shade - where seemingly nothing else will grow. 2 of them are right next to the trunks of the 2 big trees in the garden.
How to get rid of without further damaging the tree? I wonder if cutting it at soil level will suffice?
If you cut all the stems to the ground you will remove all its leaves and, as they are the food factory, the roots will starve and die. They may, initially, put up new shoots to try and make fresh foliage but just keep cutting it back to ground level and eventually it will give up.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
You could try ringing an arboretum or some such in your area. They may want your oak sapling .At least they might be able to help you move it on to somewhere.Worth a call it’s a shame to bin it.
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How to get rid of without further damaging the tree? I wonder if cutting it at soil level will suffice?