I just purchased an Hibiscus rosa-sinensis hybrid in a 4" pot. Plan to transfer to 3 gal pot and keep outside in10a zone. (Cape Coral Florida) At what night time temperature should I bring it into my garage for those rare nights??? Would appreciate any help. New hobby is Plumeria trees and I am now just starting on Hibiscus.

PlumeriaBob9, While it's small I would bring it inside during the winter months and treat it like
a house plant. Also I wouldn't put it into a 3 gallon pot either when it arrives. Slowly bump it
up.

With that stated I'm not looking forward in bringing ours inside for the winter!

Thank you for the quick response. Really appreciate it.

In zone 10a you never have to bring it in. I'm in 9a and only bring them in when there is a freeze danger. They've even survived a few light freezes.

Jay, Thank you for your answer. Much appreciated.

You are probably good to 35. Hibiscus can handle some cold temps. Probably will be rare for you to get an under 40 night.

Thank you very much Eric. I just would not want it to defoliate and slow the grow. At what temperature do they defoliate?

Hibiscuses normally do not check the temperature and decide to defoliate if it goes below "x" degrees. It is a more complicated set of scenarios including the specific variety, soil moisture, winds, temperatures, etc. Temps on either side of freezing can injure or kill so, just bring them inside before overnight temperatures typically fall below 50°F. Then put them in a window that faces south. Make sure they do not dry out or that hot/cold air vents will dry the soil quickly as humidity is low during the winter months inside the home. For Cape Coral, 50°F can start to happen near the end of November or in December. Then bring them outside when overnight temperatures are typically above 50°F.