Do you know what variety they are?

Spuds ready at this yime of year will keep in the ground. It the tops
remain, they will continue to grow. That is why commercially the tops
are sprayed to brown them off, so the tubers remain the size the
supermarket wants - also stops them getting blight infestation later.

They are unilkely to keep over winter if that is your intention, as it
is early for late season spuds.

Cliff
Bawtry, Doncaster, South Yorkshire