A gardener in southern NJ received a 6-foot double-bloom hibiscus tree in September. The previous owner neglected it. They repotted it, keep it in a somewhat heated but poorly insulated Florida room. Winters get cold. They asked if it can live dormant till spring, at what temperature to worry, and offered a photo.
The hibiscus is a tropical species; won't withstand freezing (below 32°F). Anything above is fine. If garage stays cool but above freezing, keep it there over winter. Light not important if very cool; near a window may help. It will look sad by spring but should bounce back with sun and fertilizer, especially since repotted.
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