Red Hibiscus Flower Size

Size

• A multi-stemmed shrub or small tree, the red hibiscus grows 6 to 8 feet high and 6 feet wide at maturity. The hibiscus can be planted as an ornamental accent or used in borders or hedges. The hibiscus plant presents large trumpet-shaped blooms with five or more petals. Brilliant red flowers, from 3 to 12 inches wide, show up on the upper branches of the shrub.

USDA Hardiness Zones

• Giant red hibiscus thrives planted outdoors in United States Department of Agriculture hardiness zones 5 through 10. A native of the swampy coastal areas of Georgia and Florida, hibiscus grows best in a moist, sunny location. The plant adapts well to container planting. Place it in a location with full sun on a patio or porch. Move the plant indoors when the weather cools. Giant red hibiscus cannot tolerate freezing temperatures.

Cultivation

• Red hibiscus plants grow best in full sun to light shade. If the plant receives too little sun, it will produce an abundance of green leaves but few flowers. Hibiscus plants require nutrient-rich, well-drained soil. A sandy loam is best. Hibiscus plants cannot tolerate a location with standing water. Choose a planting location protected from strong winds. It is best to plant your hibiscus in a location by itself. Hibiscus plants do not like to compete with other plants for water, light and nutrients. The hibiscus has thin, delicate roots that are easily damaged by cultivation. Avoid planting annuals around the base of the shrub.

Pruning

• Prune hibiscus shrubs and trees in early spring. Remove all dead and damaged branches. Trimming controls the shape and size of the plant and encourages an abundance of flowers. If hibiscus shrubs are not pruned, the lower leaves of the plant will wither and die, and flower size and production will be reduced.