Q.My Althea Plants Are Not Looking Good
I planted several Althea plants this spring and I have noticed two problems: the leaves are turning yellow and some of the leaves have white sections that are now turning black. Shortly after we had planted the Althea, we experienced a frost that turned many of the leaves very crispy – indicating some frost burn. I am not sure if the plants have some disease or if they are getting too much water. We have had a lot of rain over the last couple of weeks and when it has not rained we have been watering the plants. What do you recommend. See uploaded photos.

Certified GKH Gardening Expert
I think these two articles will help:
https://www.gardeningknowhow.com/ornamental/shrubs/rose-of-sharon/yellowing-rose-sharon-leaves.htm
https://www.gardeningknowhow.com/ornamental/shrubs/rose-of-sharon/rose-of-sharon-problems.htm