Hibiscus Coulteri

Description

Hibiscus Coulteri, also known as Coulter’s Hibiscus or Desert Hibiscus, is a shrub that is native to the southwestern United States and northern Mexico. It is a member of the Malvaceae family and can grow up to 10 feet tall.The plant produces large, showy, yellow flowers that can be up to 4 inches in diameter. The flowers have a bright red center and bloom from spring to fall. The leaves are green and palmate, with three to five lobes, and can grow up to 8 inches long.Hibiscus Coulteri is a popular ornamental plant because of its attractive flowers and foliage.

Taxonomic Information

Appearance

Hibiscus Coulteri is a deciduous shrub that can grow up to 10 feet tall and 8 feet wide. It has green, palmate leaves with three to five lobes that can grow up to 8 inches long. The flowers are large, showy, and yellow, with a bright red center. They can be up to 4 inches in diameter and bloom from spring to fall.The bark of the plant is gray and smooth, and the branches are woody and stiff. The plant has a dense, spreading habit and can be pruned to maintain its shape.

Care Guide

Water

Hibiscus Coulteri prefers well-draining soil and moderate watering. It is important not to overwater the plant, as this can lead to root rot. Water the plant deeply once a week during the growing season and reduce watering in the winter.

Fertilization

Fertilize Hibiscus Coulteri with a balanced fertilizer once a month during the growing season. Avoid fertilizing in the winter.

Soil

Hibiscus Coulteri prefers well-draining soil that is rich in organic matter. It can tolerate a wide range of soil types, including sandy and clay soils.

Sunlight

Hibiscus Coulteri prefers full sun to partial shade. It can tolerate some shade, but too much shade can reduce flowering.

Hardiness Zones

Hibiscus Coulteri is hardy in USDA zones 9 to 11.

Common Pests & Diseases

Hibiscus Coulteri is susceptible to several pests and diseases, including:

• Aphids
• Whiteflies
• Spider mites
• Fungal leaf spot
• Root rot

To prevent these problems, keep the plant healthy with proper watering and fertilization, and monitor it regularly for signs of pests and diseases. Use insecticidal soap or neem oil to control pests, and remove infected leaves to prevent the spread of fungal diseases.

Habitat

Hibiscus Coulteri is native to the southwestern United States and northern Mexico. It is found in desert washes, canyons, and rocky slopes at elevations between 500 and 6,000 feet.The plant is adapted to hot, dry conditions and can tolerate drought, high temperatures, and low humidity.

Question and Answer

Q: Is Hibiscus Coulteri poisonous?

A: No, Hibiscus Coulteri is not poisonous to humans or animals.

Q: Can Hibiscus Coulteri be grown in containers?

A: Yes, Hibiscus Coulteri can be grown in containers, but it will require regular watering and fertilization.

Q: How often should I prune my Hibiscus Coulteri?

A: Prune your Hibiscus Coulteri once a year in the late winter or early spring to maintain its shape and encourage new growth.

Q: How do I propagate Hibiscus Coulteri?

A: Hibiscus Coulteri can be propagated from seeds or cuttings. Take 4-inch stem cuttings in the summer and root them in a well-draining soil mix.

Related Plants

Other plants in the Hibiscus genus include:

• Hibiscus rosa-sinensis
• Hibiscus syriacus
• Hibiscus moscheutos
• Hibiscus acetosella

References

• “Hibiscus Coulteri.” Arizona State University, School of Life Sciences.
• “Coulter’s Hibiscus.” Las Pilitas Nursery.
• “Hibiscus Coulteri.” San Marcos Growers.