I think I have messed up with my little Rebutia muscula. The little thing was flowering like crazy during the summer, and seemed to be happy in his spot on the window sill.
However... he has grown long, twisty and spindly during the winter. I realise now that this is due to him searching for more light. The spot on the windowsill was ok in summer, but insufficient during winter.
What to do? Do I just move him to a new (hopefully) sunnier spot, or is he too far gone now he's stretched into an S shape?
Can he be cut or would that do more harm than good?