Need to see a picture of them please including a close up of the leaves. 50 things can cause wilting so much information is needed as well beginning with your zone/location, containers or in ground, if in containers how big are they, age of the plant, exposure to weed killer drift, watering regimen as in how often, feeding regimen, signs of disease, why watering with sprinkers, etc.

The more info you provide the better we can help. Otherwise all we can do is make guesses.

Dave