Hardy hibiscus can usually survive winter outdoors but in cooler regions (up to zone 5) will need additional protection, such as mulch and wrapping. As long as you can give it added protection during extreme freezing conditions (and as long as you don't have the tropical type-which needs to be inside over winter), then your outdoor hibiscus should be ok. The tropical varieties are the ones that require growth indoors over winter. For more information on hibiscus care, this article should help: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/how-to-care-for-hibiscus-plants.htm
Answered on September 21, 2015
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