Alice Du Pont Mandevilla with browning leaves and wilting. Causes or remedy?

Question

I have watered and fertilized but it just doesn’t seem to be helping. It has been very hot here with temps in the 90s heat indexes above that. Should I move it out of the sun?

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Answer 1

If you think your plant is getting cooked by the heat, it's alright to move it into partial sun, so long as it gets sunshine most of the day. This plant doesn't respond well to over-watering or under-watering, but a more serious issue could be a fungus. Here's an article that tells you how to treat the common diseases that afflict mandevilla:
https://www.gardeningknowhow.com/ornamental/vines/mandevilla/mandevilla-disease-problems.htm