Mandeville

Question

Last week I went out and all the flowers on my mandeville were wilted . And with in a few day the whole plant is wilted looking. I don’t see any holes in the dirt around the plant for moles or voles please help. Thanks. Rosemary

Answer 1

Is the soil excessively wet or dry?
Do you see markings on the leaves?
Yellowing of leaves?

Root rot can cause sudden wilt along with plant that is too dry.
Pests and disease could also cause sudden death of a plant.

https://www.gardeningknowhow.com/ornamental/vines/mandevilla/mandevilla-plant.htm