I don't think it would matter for two weeks.

You could take off the ones that are in full bloom now, but I tend to agree with Steragram.

I cut mine back last year,before going on holiday,in the heat of last summer,and it worked well.A shame to take off all the lovely flowers,but I had a lovely new display when I got home :o).

My advice would be to just ask the neighbour to water them for you.....every day if he/she is able....and when you come home assess the situation. If they look poor cut them right back and you will find within 2 or 3 weeks they will come back and flower again. I did this some years ago and had wonderful flowers again. Don't worry and enjoy your holiday.

I think its a bit much to expect deadheading unless they are a keen gardener. I tend to dead head just before I go away, but I always leave a few small buds so as not to totally confuse the plant!

If you mean surfinia petunias, been growing those for years, and I never deadhead them - they carry on flowering just fine, so long as they're watered and fed sufficiently.

Thanks for all the comments. Perhaps my concerns were a bit OTT. It's just that there are masses and I mean MASSES of flowers and I didnt fancy the thought of deadheading on an olympic scale when we returned home!! Happy now about what to do .....cancel the hols! Thanx again happy gardening.