We planted Rose of Sharon last fall. They are various sizes from about a foot tall to over 3 feet tall. It was a very cold winter. We liven in central NY. Trees are starting to bud and show leaves. It is the last week in April. I see nothing on the Rose of Sharon. Are they dead? They are from my grandfather's house and he just passed away. I really don't want to lose these plants.
Rose of Sharon
In my experience, the Rose of Sharon shrubs are one of the last to leaf out in the Spring. My Forsythia bush has even been very slow this year for some reason. So I would give them a good full month yet and see what happens. You can certainly give them some water with root stimulator and a product called Super Thrive mixed into the water, this will help give the root system a little wake up call and help it get going so the top growth comes on well. Here is a link to an article of interest for you too: https://www.gardeningknowhow.com/ornamental/shrubs/rose-of-sharon/pruning-rose-of-sharon.htm