Leaves Dropping on Mandevilla plants

Question

I have two Mandevilla plants (red blossoms) and am having trouble this year with the plants. During the summer months here in Central Texas the weather is hot (ours are placed in partial sun only). There were no flowers this past season. For the last three months the plants have been producing new leaves quickly…but they turn yellow and drop right away. No flowers and the plants look sick…but the new growth is doing well…except that leaves drop so fast. Not sure what I am doing wrong…in previous years the flowers were beautiful. The plants are about 6 years old.

Answer 1

I've included some articles below that might help uncover the cause of the leaf drop, from environmental to fertility to disease and pests. If none of these answer your question, contact your local extension agent for more information.

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

https://www.gardeningknowhow.com/ornamental/vines/mandevilla/yellow-leaves-on-mandevilla.htm

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

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

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