Answer: Overwintering indoors and then taking your hibiscus outside during the warmer weather is a routine lots of gardeners in your region follow. The only problem they report is poor flowering. This is due to the time it takes your hibiscus to reacclimate to the outdoor growing conditions. They flower best when it is hot and sunny. While you can't lengthen your summer weather you might try taking it outdoors earlier in the spring, hauling it back indoors at night. This way your hibiscus will get a few more weeks of sunshine, which may prompt more blooms during the summer months. Wish I had more solutions!
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