I don't think they wilt if you play everyday. but if you leave it a few days or more then I'm guessing they will. (but a lot less than would do if you had a different ordinance)
I always forget to water my flowers and I have yet to see any wilt with the Beautiful Town ordinance. I'm really bad when it comes to that stuff. I'll go to water them and then see a pretty bug fly by or a present in the sky… Yeah, gardening is not for those of us with the attention span of a squirrel.