I have no idea but found this info online. Hope this helps.
Getting Tropical Hibiscus Ready to Come Inside in the Fall/Overwintering Indoors
If you want to keep your hibiscus and grow them again the next season, you will need to bring them indoors before the night temps drop much below 40° F. They will need a bright or sunny area, or under fluorescent lights. The optimum temperatures indoors seem to be between 55 and 70. The cooler end of that temperature range will produce far fewer insect problems later in the winter. If they are kept in a greenhouse, keep them cool (55-65) and water when they are dry.
Ideally if you want to bring your hibiscus indoors to over winter them, they should be grown in pots outside all season, not planted directly in the ground. The problem with planting in the ground is that when you dig them up in the fall, they are weakened by yanking them out of the ground and many times they will rot before they produce new roots in a pot. They should be kept in relatively small pots for years (10-14" in diameter is fine). You can even sink the potted plants in the ground in summer and then just pull them up , pot and all in the fall, wash off the pot and bring it inside easily with no shock to the plant in fall.
- Before you bring them inside, cut back your plant(s) quite a bit, to within 4-5" of the main stems. This does a few things: it will help eliminate the bugs and insects that hide in the plants BEFORE they get inside. They like to hang out in the tips of the branches, in the newest growth. Also remove any dead leaves, stems., old flowers or debris in the pots, or on the plants.
- If you want the best chance of having healthy, vigorous plants with flowers next summer, your plants need to rest indoors during the shorter days from October till Feb. or March. DO NOT push them to keep blooming indoors and leave them full of old foliage.
- After cutting back your plants, but before they come inside, be sure and hose them down , making sure to blast the stems, under the leaves, etc. Let them dry thoroughly and bring them inside. This will eliminate the need for any insecticide at all. if you must spray, insecticidal soaps and neem oil work well. Drench the upper and lower parts of the leaves, as well as the stems and let dry thoroughly outside for a day or so before they come inside.
- The leaves will probably turn yellow and fall off when the plants are brought inside, this is normal. They will regrow when they are ready. In the meantime, water very sparingly! Do not keep the soil wet. It is best to let the soil become almost bone dry before soaking it again. Do not let any water sit under the plants in saucers, etc.
- Your plants will rest and may not produce new leaves until late February or March. This is normal too.
- Realize that many times, hibiscus never bloom well again after the 1st winter inside. There is not much you can do about this. It appears that the generic grocery store, Costco, Home Depot, etc., hibiscus tend to not bloom well again after the 1st season. The new large flowered hybrids seem to perform much better year after year. This is an observation based on my experiences over wintering hibiscus. Your hibiscus experience may vary.
- The other option is to buy some new hibiscus each year, enjoy their prolific flowers for the summer and toss them in the fall. That way, you are guaranteed lots of flowers each summer.
http://www.trop-hibiscus.com/gindr.html
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