What is the Best Growing Temperature for Tropical Hibiscus?

“How warm do I have to keep my house for a tropical hibiscus? I live in Maine, and it gets quite chilly!” Question from Valerie of East Andover, Maine

Answer: Your tropical hibiscus (Hibiscus rosa-sinensis) will grow best in temperatures between 55and 85ᵒ Fahrenheit. If temperatures drop below 50 F, it will require some protection. Inversely, temperatures above 100 will cause it high stress, but that’s certainly not a problem you will have. Tropical hibiscus also grows best with a higher level of ambient humidity.

Just give you plant warmth above 55ᵒ, good humidity, and it should grow well until your spring days grow warmer. Also, be sure not to overwater hibiscus growing at cooler temperatures. Less water is needed under cooler growing conditions, and too much water can cause root rot.

Happy hibiscus growing!

Jessie Keith

Black Gold Horticulturist



Plants are the lens Jessie views the world through because they’re all-sustaining. (“They feed, clothe, house and heal us. They produce the air we breathe and even make us smell pretty.”) She’s a garden writer and photographer with degrees in both horticulture and plant biology from Purdue and Michigan State Universities. Her degrees were bolstered by internships at Longwood Gardens and the American Horticultural Society. She has since worked for many horticultural institutions and companies and now manages communications for Sun Gro Horticulture, the parent company of Black Gold. Her joy is sharing all things green and lovely with her two daughters.

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