Answer: Glad you are happy with the prompt response but sorry I misunderstood your question. I thought you were referring to a tropical hibiscus rather than a hardy hibiscus (Rose of Sharon). If you have a hardy hibiscus, you can plant it now as long as you provide some protection from the hot sunshine for a few weeks. Once it becomes established and has adjusted to its new growing spot, it can take full sunshine. Or, you can wait until the weather cools a little before planting it. In this case, no temporary protection will be necessary; late summer and early fall sunlight isn't quite as intense as mid-summer sun.
Hope this answers your question. Be sure to stop by again soon!
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