I had this plant for 3 years. This year the leaves are closed, flowers are not blooming and the vines are brown. Help. I have not done anything different this year. My other 3 Mandevillas are growing and healthy.
Sun Parasol Mandevilla
Certified GKH Gardening Expert
There are many, many reasons thhis could have happened. Right now, you need to determine if the plant is still alive. This article will help with that: