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The Temperature Zone for Hibiscus

By Catherine Duffy ; Updated September 21, 2017
Hibiscus are colorful, warm weather flowers.

Some hibiscus varieties are native to the Southeastern United States while others originate in warmer areas of southern China and Asia. All hibiscus plants do well in warm climates where temperatures do not dip below 55 degrees Fahrenheit. Gardeners often grow hibiscus indoors where they thrive in controlled, warm climates.

Hardy Hibiscus

Hibiscus flowers of differing species and varieties thrive in United States Department of Agriculture Plant Hardiness Zones 4 through 11. Zone 4 is the coldest zone where hibiscus are found. Winter temperatures in this zone are known to drop to minus 20 F. Only the hardiest perennial hibiscus are able to withstand these severe temperatures. Kopper King is a perennial hibiscus that, in this growth zone, dies back to the ground each winter but reemerges to bloom again in spring. Other cool weather hibiscus include common rose mallow (Hibiscus moscheutos) and Rose of Sharon (H. syriacus).

Hot Climate Hibiscus

Hibiscus rosa-sinensis, also called Rose of China, Hawaiian hibiscus or Chinese hibiscus, is grown outdoors in warm climates such as those found in zones 8 through 11. Zone 8 and 9 cover a large swath of the Southeast as well as the West Coast shoreline. Zone 10 is found in southern Texas and Florida. Hibiscus in these areas grow well in containers or in gardens where their fragrant blooms display from spring until the weather cools in fall.

Indoor Hibiscus

Over 200 species of hibiscus exist and most thrive indoors. When growing hibiscus indoors it is important to maintain a consistent temperature. Cool drafts, warm electrical appliances and proximity to heaters or air conditioners can damage hibiscus. Maintain a temperature range of 55 to 75 degrees Fahrenheit. The upper range of temperatures encourages optimal growth. When hibiscus experience bud drop, the main culprits are cold, limited light, excessive heat or irrigation extremes. Hibiscus prefer slightly moist, well-fertilized soil.

Considerations

Hibiscus are tropical and subtropical plants that are prone to diseases brought on by humidity and warmth. Whether grown indoors or out, check your plants for aphids, white flies, spider mites and Japanese beetles. Removing debris lessens the chance that insects will infect your hibiscus. Fungi is also a problem and causes leaf spot. Southern stem blight is another fungal disease. Ensure that mulch does not touch the plant's stem. Keep plants well maintained and avoid overcrowding. Divide hibiscus in spring, as they will not tolerate fall division.

 

About the Author

 

Catherine Duffy's writing can be found on gardening blogs, tech sites and business blogs. Although these topics seem quite different, they have one area in common: systems and design. Duffy makes systems and design (as they pertains to plants, supply chains or software) entertaining and welcoming to general readers.