I am glad you like hibiscus as it it one of my favorite plants. Unfortunately, hibiscus is a tropical plant and does not do well in colder climates. Most hibiscus species thrive in zones 5-10.

Other than planting hibiscus in containers like you did and bringing the plants indoor for the winter months, there is no other specie that will survive the winters where you are in Michigan.

Thanks for asking,

Diana
Diana´s last blog ..Gardening Tips and Ideas for Beginners

It sounds like your hibiscus do have a disease. In general, hibiscus are very hardy and are easy to maintain even in drought conditions. It is possible that they came to you with the disease from the grower.

Cut them down short, almost almost to the bottom of each plant. Dig around the soil and give them some good nutrient rich soil like Miracle Grow top soil. Water them good and leave them alone for a while. If you start seeing new growth in a couple of weeks, chances are that you will be able to save them and these may grow healthy again. If not, my recommendation is that you get rid of them.

Hope this helps Sabrina. Do let me know what happens to your hibiscus.

Diana
Diana´s last blog ..It is time to Clean up the Garden for the Winter Months

I purchased two hibisucs mocheutos, southern bell mix. For a few months they were growing beautifully, gave me a few spurts of new buds, bloomed and even produced seed pods. Now, both of my plants seem to be dying from the stem down. I have one planted in the front and one in the back of my house, although I feel they picked up their sickness from the grower. They have a blackness too them that spreads from top to bottom. Any ideas what I can do to save these two. I’m wondering if I should dig them out before the disease spreads to my other plants. Of course I would really hate to do this.
Any help would be great.
Thank you
Sabrina