Do you mean the flowering is finished or the plant is finished? I doubt if it's the plant, which will be looking a bit ratty by now, eh? Give it a savage haircut and it'll bounce back.

The plant itself is quite healthy it's just the flowering which is finishing and I was wondering if I needed to cut it back or not. Kathy

Yes,It could do with quite a severe haircut back to the lowest bud,then it will regrow with vigour into a lovely bushy plant. I have it as an infill in some large borders,and it looks magnificent. Also in case you didn't know the flowers are fantastic in salads,looks sensational and tasted good. Judie