Petrocodon

Description

Petrocodon is a genus of flowering plants in the family Gesneriaceae. It is native to China and Vietnam and includes about 40 species of annual and perennial herbs. These plants are known for their showy flowers that come in shades of purple, pink, red, and white. Petrocodon plants grow to a height of 10 to 30 cm and have a spread of 20 to 50 cm. They are suitable for rock gardens, borders, and containers.

Taxonomic Information

Appearance

Petrocodon plants have oval to lance-shaped leaves that are shiny and dark green. The flowers are tubular and have a two-lipped corolla with five petals. The upper lip is usually two-lobed, while the lower lip has three lobes. The flowers bloom in the spring and summer and attract bees and butterflies. These plants are not frost-tolerant and require protection in areas with harsh winters.

Care Guide

Water: Petrocodon plants prefer moist but well-draining soil. Water them regularly during the growing season and reduce watering in the winter.

Fertilization: Feed Petrocodon plants with a balanced fertilizer every two weeks during the growing season.

Soil: These plants grow best in well-draining soil that is rich in organic matter. A pH range of 6.0 to 7.0 is ideal.

Sunlight: Petrocodon plants prefer partial shade or dappled sunlight. Avoid direct sunlight, as it can scorch the leaves.

Hardiness Zones: Petrocodon plants are hardy in USDA zones 7 to 10.

Common Pests & Diseases

Petrocodon plants are susceptible to spider mites, whiteflies, and aphids. These pests can be controlled with insecticidal soap or neem oil. Root rot can occur if the soil is too wet, so be sure to allow the soil to dry out slightly between waterings. Powdery mildew can also be a problem in humid conditions. This can be treated with a fungicide.

Habitat

Petrocodon plants are found in rocky areas, meadows, and forests in China and Vietnam. They grow at elevations of 1000 to 3700 meters above sea level.

Question and Answer

Q: Can Petrocodon plants grow indoors?

A: Yes, Petrocodon plants can be grown indoors in a bright, humid location.

Q: How often should I fertilize Petrocodon plants?

A: Fertilize Petrocodon plants every two weeks during the growing season.

Q: What is the ideal pH range for Petrocodon plants?

A: Petrocodon plants prefer soil with a pH range of 6.0 to 7.0.

Q: Can Petrocodon plants tolerate frost?

A: No, Petrocodon plants are not frost-tolerant and require protection in areas with harsh winters.

Related Plants

• Aeschynanthus
• Chirita
• Primulina
• Streptocarpus

References

• “Petrocodon.” Plant Finder. Missouri Botanical Garden, n.d. Web. 23 Feb. 2022.
• “Petrocodon.” The Gesneriad Reference Web. Gesneriad Research Foundation, n.d. Web. 23 Feb. 2022.
• Wang, W.T., Pan, B., Li, Z.Y., & Weitzman, A.L. (1998). “Petrocodon (Gesneriaceae), a new genus from China and Vietnam.” Novon, 8(4), 447-450.