The type of hibiscus I have in Michigan will grow back vigorously regardless of how far I cut it back. I can it down to 3 inches and it comes roaring back. Be careful though because your Hibiscus may be a different species than mine. I don't have much knowledge of Hibiscus except the ones I have are also called Rose of Sharon or Althea sp. I had one blue flowered one years ago that died after two years but it left a hundred baby volunteers behind. They are just light pink though. Not blue. They are so aggressive that I have to machete them back from time to time. They out compete butterfly bushes and that's saying something.

I agree, you can prune it pretty hard. Then give it a light feeding to encourage new growth. When it starts to put out new growth, pinch about 2-4" off the tips of each new branch. This will encourage the new growth to branch again lower and make it even more bushy and full. You must be in the southern part of the state. Here in NorCal we just let the winter prune them for us, lol. But in a warm sheltered spot sometimes they can get pretty big.

Hi Wayne. Do you have the names of the last two. They are great. Where do you buy your plants. I have a hard time finding different varieties in my area. Thanks Judy

Humber Nurseries usually has them. I saw all kinds of gorgeous ones today at my local Canadian Tire. I also saw some at the Ultra store in our area. Check there as well.