Recently there was a thread where sunburned leaves were discussed and how to read a plumeria in regards to watering. I took some pictures to post into that thread but we were OBE so here it is as a stand alone.

Here is a sunburned Desert Sunrise. This plant was in a 1 gal container, fell over and was not watered for 2 days and began to wilt. its already recovered and been up potted into a 3 gal container. The leaves are ugly but outside of that it's just fine. This is a good example of too dry, too quick, and too hot.

Backyard and spring 2017 · More Info

Here is an example of a Grove Farm (I think) in a fabric pot being chronically dry where the plant is loosing the lower leaves and other leaves show some yellow edges. I had to bump up the drip emitter on this plant. The yellow leaves eventually fell or will fall off. During hot summer months this is a good example of not enough water per watering cycle to supply the whole plant. The plant naturally decides to keep the most efficient and effective leaves (the new ones) and loose the old stuff by pulling out energy and walling off those leaves. They dry out and fall off.

Backyard and spring 2017 · More Info

Its important to consider the time of year and local weather conditions as the onset of dormancy can look very much like under-watering. The onset of dormancy should be a time to stop fertilizing and reduce watering from summertime levels to a less amount. For me there is absolutely no potential of dormancy onset when I took these images in Mid August so it's clearly under watered.