Hi Brandnewgardner, Sounds like Erinose Mite to me. Where do you live. Some countries do not have Erinose Mite yet, so need to know this to confirm EM as a possibility. Let us know if it is EM. Good luck, Brian. Here is a link that might be useful: Erinose mite

Rosco_P, First, I love the name you used! Second, you are welcome. I really enjoyed taking the class it did help explain much to me as well regarding coloration of plants. And now I can pass on what I have learned.

I think it is something else that no one has mentioned - the color of your pot. Almost all plants hate to have their roots cooked and a dark colored container will absorb more heat. Being in a container is not the same for the roots as a natural environment where the roots are below ground. I purchased a plant a couple weeks ago and until I got around to planting it, it sat in its black nursery pot out in full sun. Well, the second week, when the really high heat hit (90s), it started almost immediately with the yellow leaves. I got it in the ground and the yellow leaves stopped almost immediately. I bet recently true summer has started for you, too. I realize your zone and that you cannot plant the hibiscus in the ground. So you can do several things: move it to a light-colored container; move it to where other plants shade the container (put it in between some low shrubs or bushes where the trunk/leaves still gets full sun); or plunge (bury) the pot in the ground until winter. All three will help tremendously. Carol in Jacksonville

Hi Gardengopher.... I am just getting re-started on Hardy Hibiscus... and still have two in pots... trying to figure out where to plant them.. lol I am in Tennessee also.. in Perry County... Carolyn