My hibiscus is not blooming but has lots of green leaves and looks very healthy. What should I do?
You likely have to much Nitrogen in the soil.
This will cause lots of lush green leaves and little flowering.
You can add Phosphorous to encourage flowering. Bone Meal is a good way to do this.
Here are some links to help you.
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-fertilizing.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm
My first hibiscus plant - I loved it outside and I want to save it. How do I winterize and debug it? Do I clean the soil? If so, with what? And the leaves, do I wash the leaves with something or do I spray them? Please help me. Thank you.
If you are bringing in a potted tropical hibiscus, you can hose it down well with water and cut it back by up to 1/3 before bringing it indoors. Neem oil is a good treatment for any pest issues that you may have. If your plant is a hardy variety, it will not require any special care over winter and should not be cut back until spring. These articles will help as well: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/wintering-hibiscus-indoors-winter-care-for-hibiscus.htm
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/how-to-care-for-hibiscus-plants.htm
I have a hibiscus but most of the blooms come out funky or looking dried or stunted. The leaves on the plant look healthy enough, just the blooms are funny. I have sprayed the plant with Ortho Ecosense brand garden disease control. I probably sprayed the entire plant thinking it was the right thing to do. I sprayed it a couple of weeks ago. I really would appreciate any advice you can give me. Thank you for your help.
It sounds like you have thrips. They will attack the blossoms. This article will help:
https://www.gardeningknowhow.com/plant-problems/pests/insects/controlling-thrips.htm
Is it possible to bury a tropical hibiscus (as some suggest doing for roses in extremely cold areas) and have it survive? That is to say, if I set the tropical hibiscus in the ground sideways and covered it entirely with dirt, would it survive the cold weather (even with no light)? Have you ever done this before or heard of it being done successfully?
Unfortunately, a tropical hibiscus plant will not survive winter outdoors, even if it's buried it will likely die, and must be brought inside. Only the hardy types can survive winters outside in your zone. This article will help: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/wintering-hibiscus-indoors-winter-care-for-hibiscus.htm
Can I transplant a mature hibiscus? If so, how and when?
You can and early fall is a great time to do this. Don't wait too long into fall or else the plant will not have time to establish before cold weather sets in. So if you cannot do it this fall, spring is also a good time.
Also, it may help to do it in the evening to reduce stress/transplant shock, and be sure to include as much of the roots as possible. This article will help avoid transplant shock: https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm
I would also trim the plant back by 1/3 right before you move it, as this will improve the chances of the plant's ability to survive the move.
Leaves are being eaten on hibiscus. Also, some cottony looking web on some leaves. What is a good all-purpose spray for hibiscus?
It sounds like you have either mealybugs or possibly scales, which are closely related to mealybugs. The insect forms a cottony mass on the lower sides of branches. These are usually controlled with horticultural oil sprays. Neem oil is also effective. Here is more iinformation: https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm
https://www.gardeningknowhow.com/plant-problems/pests/mealybugs-white-residue-on-plants-leaves.htm
https://www.gardeningknowhow.com/plant-problems/pests/scale-bug-how-to-control-plant-scale.htm
Have a large Hibiscus, looks very healthy but hasn't flowered this year. What should I do, please? Thanks Sheila
There could be a few reasons for lack of flowering including sunlight and water.
Generally the plants that appear lush and green have to much Nitrogen in the soil.
Adding a Phosphorous rich fertilizer such as Bone Meal will encourage blooming.
Here are some links for you.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/how-to-care-for-hibiscus-plants.htm