I think the best thing it to watch it and wait a while longer. If it is a hibiscus it should be coming from the base of the trunk. If it is coming from more than an inch or so away I doubt it is a hibiscus. Those plants just cannot take a hard freeze and survive. You might want to plant any new ones you get in a large container so you can move it in to a semi protected area such as a garage or better yet a well lighted area when winter arrives.
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