This tree comes in tropical and cold-hardy varieties. Prune your Gudhal plants if you want to change its shape or control height busy flowering plant. Temperatures below freezing will injure hibiscus. Usually grown as an indoor evergreen, these will survive outside in USDA zones 9 and warmer. If your Hibiscus is 3 meters high bring it back to 2 meters. Tropical hibiscus produce large, showy flowers and make excellent shrub and specimen plants in U.S. Department of Agriculture plant hardiness zones 9 through 11. The plant requires consistent watering because potting mixture dries quickly and tropical hibiscus tends to turn yellow and drop flower buds without adequate water. Once you’ve potted your plant, check its soil daily to make sure it’s moist. Tropical hibiscus flowers are one of the enduring symbols of the tropics. The Tropical Hibiscus Handbook, Barry Schlueter Ellen Barredo is a certified Missouri Certified Nursery Professional with more than 30 years in professional horticulture. Tropical hibiscus can survive dips in temperature, but may show damage or even die back if it drops below about 35F (1.5C). Hardy in U.S. Department of Agriculture plant hardiness zones 9 through 11, tropical hibiscus grow best in full sun to partial shade and fast-draining, moist, fertile soils. If I can do it, you can, too. If you have a low spot in the garden, perennial hibiscus is an excellent bet for mid- to late-season color. If it seems … While inside, your Hibiscus plant will need less water and no fertilizing. Under 30°F (-1°C) for many hours will most likely kill the plant entirely. The trick to success is twofold: managing the deadly winter, and fending off hungry insects. Hardy Hibiscus 4. Winter Hibiscus Care Tips.
Every year when I lived in Iowa, I'd bring my favorite hibiscus in and out. Place them by a bright window and away from drafts or vents. You should also keep your hibiscus plant near a window so it can get at least a couple of hours of direct sunlight. Temperatures like this can cause them to lose some flower buds and not produce as many new buds until temperatures cool again. Check the plant often because it may require watering twice daily during hot, sunny weather. However they can be more difficult to care for and to get to flower every year. When you care for a hibiscus, you should remember that hibiscus flowers best in temperatures between 60-90 F. (16-32 C.) and cannot tolerate temps below 32 F. (0 C.). Water potted plants when the top half-inch of soil feels dry. Hibiscus are pruned according to their growth usually about one third as a rule of thumb, e.g. Use a lightweight soil, like loam or peat moss, to give it the nutrients it needs.

Perennial hibiscus grows best in moist soil that never completely dries out (this type can handle a bit more water than tropical hibiscus).

Though hibiscus are tropicals, they can suffer a bit if temperatures stay above 100F (37.5C) or so for extended periods. The bright, showy blooms of the hibiscus plant are prized by gardeners who want to add a tropical feel to their landscapes.
If your hibiscus is dropping leaves, or you're seeing yellowing leaves at the top of the hibiscus, … Factors such as how cold and for how long, the age of the plant, and whether it is dehydrated determine how extensive the damage.