Can I transplant my dinner plate size Hibiscus now, or do I have to wait till spring?
Early fall is a great time to transplant a plant. Don't wait too long into fall, or else the plant will not have time to establish before cold weather sets in. If you cannot do it this fall, spring is also a good time.
Hibiscus plant is wilting. Is there anything that can be done to save the plant?
You did not mention whether the leaves were also turning color, which is usually indicative of the problem. It is possible that it could be hibiscus wilt disease. If so, the leaves will slowly wilt and die, but unlike other wilt problems, they do not turn yellow. Instead, plants affected by wilt disease remain green and may slowly darken as they wilt to a dark green, brown, or black color. Wilt disease will also affect the entire plant. Check your soil. Is it wet or dry? If it is very dry, the wilt may just be caused by drought or underwatering. A quick dose of water will solve this problem! But if the soil is damp or wet, it could be that you are over watering (which will also result in yellowing of the leaves) or wilt disease.
Try mixing a pint of bleach with 2 quarts of warm water and pour around soil, saturating it well. This should kill off the fungi growing in soil. Keep in mind that this may or may not work. As an alternative to the bleach, you can try using a copper based fungicide or any product containing thiophanate methyl.
We planted our Hibiscus plant in our garden and was wondering do we need to dig it up and bring it indoors for the winter?
It depends. Is it a tropical or hardy hibiscus? If it is tropical, it will need to come in. If it is hardy, it will be fine left in the ground.
No cut it down to about 3- 5 inches cover with leaves or mulch,outdoors only in the ground, will the roots thrive if left in a planter the roots freeze.
How and when do you prune a hibiscus?
Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/tips-for-pruning-hibiscus-plants-when-to-prune-hibiscus.htm
I have several hibiscus plants. One of them gets NO direct sun and is in the shade at all times. It also seldom blooms. I'm thinking of digging it up and putting it where it will get much more sun. Do you think this is a good idea?
Yes, I think it is a good idea, but I would wait until spring to move them. They will have a better chance of surviving after being moved if they are moved in spring.
I have 2 hibiscus plants and the deer keep eating off the leaves. I spread pepper on what I think they are still eating. What do I do?
Deer can be tricky, especially if you live in an area where deer are going hungry (which is a great many places now with the rampant deer over population).
You may want to try bird netting or set up line of fishing line around the plants. Deer tend to be put off when running into these things. You may also want to try a store bought deer repellent. There are several pretty good ones these days. This article will also have some other ideas:
https://www.gardeningknowhow.com/plant-problems/pests/deer/deer-repellents.htm
I planted two hibiscus 2 years ago. One is quite big, the other about 18 inches high. Both have yellowing leaves. What is the best to put on them? Should I prune them back at all?
These articles may help: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/answers-to-what-causes-hibiscus-leaves-turning-yellow.htm
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-fertilizing.htm
As for pruning, you may want to wait until spring. Here is more information: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/tips-for-pruning-hibiscus-plants-when-to-prune-hibiscus.htm