When transplanting in season, do dead leaves signify a dead plant? A friend insisted on us digging up her althea and taking it to our house in the spring of this year. All of the leaves and blooms died and the plant looks dead. Can the adult shrub be revived?
The Rose of Sharon is likely suffering from a bit of shock, which is normal as the plant acclimates. You can cut it back some to alleviate some of the stress so that the plant can focus its energy on root establishment. This article will help with pruning: https://www.gardeningknowhow.com/flower/pruning-rose-of-sharon.htm
Why did my flowers on my Althea bush turn from solid white to white with purple throat?
A white Rose of Sharon can produce flowers can change color, reverting to mauve or pink. They can revert or have changes due to the hybrid of this plant.
https://www.gardeningknowhow.com/ornamental/shrubs/rose-of-sharon/rose-of-sharon-bush.htm
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.
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
I have an Altha that is about 4 yrs old that is growing downward instead of up and out, almost like an umbrella. It is otherwise healthy and had tons of double blooms this year. How ever it looks really strange. What do I do with it?
I do not have this problem with my varieties of Althea (a.k.a., Rose of Sharon; Hibiscus syriacus) but this happened to a friend when the branches bent from the weight of the flowers; the branches get leggy and the canopy becomes top heavy. She tried to prevent this problem by pruning the bush in the winter or early spring but I never do so, oh well. If you provide some additional water during the summer and this does not help self correct the branches, you may need to prune them in early Spring.
Do I cut the branches and put straw around the base?
Rose-of-Sharon prefers full sun and appreciates protection from winter winds. Flowers are formed on current season’s wood so pruning, if desired, should be done either in late fall, in winter after leaves drop or in early spring before buds form. Note: if the trunk survives your WI winters and leafs out, there would be no need to prune. Tropical hibiscus (a.k.a. hibiscus rosa-sinensis) is frost tender is most of the U.S. and should be brought inside. Hardy hibiscus (a.k.a. hibiscus moscheutos) is typically winter hardy to z5.