I would love to create a thread for best practices regarding basic Hibiscus care and really focus on 'wintering' our friends. I can share my experiences and hopefully others do. I encourage others to use this thread for questions and add their knowledge.
I am currently at my time ability to keep up with the over 50 tropical plants, and want to pass along some should haves.
Last winter I had fewer plants and struggled to keep up with several pests. These were fungus gnats, white flies, and spider mites. In preparation for this winter I focused on the insects that annoyed. These were the gnats and flies. Before I brought the plants in, I researched techniques to assist. I invested in a systemic pesticide for the flies and invested in some worm castings and neem oil. I started the systemic about a month ahead and added the worm castings. My fertilizer also contains a low levels of simple detergent. A week or so before, I thoroughly sprayed the plants with neem oil.
A week after this, I am annoying pest free. Problem is, I did not attack the worst pest. I battled the spider mite last year, and this year, I have a real challenge with twice the plants.
Learning forward, I should have addressed the mites. Horticulture Oil and water are the best methods I have learned.
When using hort oil, spray only in the afternoon shade. Allow for a few hours to dry. Do this 3-4 times over two weeks prior to moving the plant inside. Make sure you get the oil on everything, including the pot, under leaves, and on the stems. Repeat a few times over several weeks to ensure you terminate the full mite life cycle. Next year, I will purchase a hose sprayer and mix myself.