How tall does the Rose Mallow hibiscus get? Does the Rose Mallow hibiscus also need pruning, and if so, when?
Hibiscus plant height can vary depending on the variety; however, most tend to grow upwards to 10 feet. Those grown in containers will be considerably smaller, as their growing space is limited. Pruning can also help minimize the growth of these plants. This article will help with that: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/tips-for-pruning-hibiscus-plants-when-to-prune-hibiscus.htm
I had a thriving Lavatera. This year at flowering time it started to droop and die. I cut it right back and it does have new foliage appearing. Does anyone know what happened?
It could have been several things. A fungus or a root problem sounds most likely as when you cut it back, it started to recover.
Lavatera bloomed great for few weeks. Now buds not opening though watering well. Will it bloom again this year?
Not knowing what kind of mallow you have, I can't say whether its flowering season is over, but when you're having problems with a plant, the first thing to look at is the culture. Again, since I don't know the variety of the plant we're talking about, I can't make anything but general suggestions; you might try cutting back on the water, adding bone meal to the soil, or looking for bugs that consume flower buds.
I do not remember planting these flowers. Can you tell me what kind they are?
You likely did not plant Mallow, but it grew as a weed.
Here is a link with more information.
Can I divide swamp rose mallow (like a hosta)?
Yes, you can propagate from division, but do this in spring.
Here are some links with more information.
The leaves on my rose mallow turn yellowish brown and shrivel up every year. The flowers don't seem to be bothered. What could be causing the leaf damage? I see no pests.
This could be a disease called hollyhock rust. Please see these articles for more information:
If it's not that, some other possibilities are discussed in this article:
Plants in the hibiscus family, like rose mallow, often develop yellow leaves. They tend to be sensitive to the problems discussed in the above article.
My Rose Mallow plant has been adorning my garden for 3 yrs now. We have been thru a few bug problems and survived. This summer, in Ontario, which has been very hot and humid, the leaves are turning yellow and dropping. Because of the extreme heat I water when plant starts to wilt or, every other night. This plant is my garden joy so I don't want to kill it. Any suggestions?
Watering is key to the health and growth of you Rose Mallow.
I would increase the watering to keep your plant from wilting.
When the plant wilts, it's all ready stressed.