What happens if quite a few leaves of the mandevella turn yellow in outdoor pot in summer?

Question

With the mandevella plant in an outdoor pot, what action should be taken if quite a few leaves turn yellow? please note in summer.

Answer 1

There could be quite a few reasons why this is happening. This article will help you narrow down what is the most likely issue: https://www.gardeningknowhow.com/ornamental/vines/mandevilla/yellow-leaves-on-mandevilla.htm