Cut them as soon as they dry out back to the ground.

They do not seem to need a lot of feeding and seem to thrive on poor soils
but a good mulch of peat will help to keep the cold out and suppress the
weeds. It would be advantageous to the plants to resist cutting yours next
year, they really do need to be well established before cropping.

You will find that many of the red berries will have fallen to the ground.
They will germinate next year and become weeds to be rooted out.

I hope you'll never think of getting rid of them for you'll need a JCB - the
root ball on each is tremendous!

Geoff