Streptocarpus

Description

Streptocarpus is a genus of flowering plants that belongs to the family Gesneriaceae. This genus consists of more than 100 species of herbaceous plants that are native to the tropical regions of Africa. It is commonly known as Cape Primrose, which is a misnomer, as it is not related to the true primrose family. Streptocarpus is a popular houseplant known for its attractive foliage and beautiful flowers.

Taxonomic Information

Domain	Eukarya
Kingdom	Plantae
Phylum	Tracheophyta
Class	Magnoliopsida
Order	Lamiales
Family	Gesneriaceae
Genus	Streptocarpus

Appearance

Streptocarpus plants have rosettes of leaves that can range from a few inches to over a foot in diameter. The leaves are thick and fleshy, and can be green, silver, or variegated. The flowers are trumpet-shaped and can be single or double, depending on the cultivar. They come in a wide range of colors, including pink, purple, white, and blue. Some varieties also have a sweet fragrance.

Care Guide

Streptocarpus is an easy-to-care-for plant that can thrive in a variety of conditions. Here are some care tips:

• Water: Water the plant when the soil feels dry to the touch. Avoid overwatering, as this can lead to root rot. Use room-temperature water, and avoid getting water on the leaves to prevent fungal diseases.
• Fertilization: Fertilize the plant once a month during the growing season with a balanced, water-soluble fertilizer. Avoid fertilizing during the winter months.
• Soil: Use a well-draining potting mix that is rich in organic matter. The soil pH should be between 5.5 and 6.5.
• Sunlight: Streptocarpus prefers bright, indirect light. Avoid direct sunlight, as this can scorch the leaves.
• Hardiness Zones: Streptocarpus is not cold-tolerant and should be kept in temperatures above 60°F (15°C).

Common Pests & Diseases

Streptocarpus is generally resistant to pests and diseases, but it can be susceptible to the following:

• Spider Mites: These tiny pests can cause yellowing and stunted growth. Use insecticidal soap or neem oil to control them.
• Thrips: These pests can cause distorted leaves and flowers. Use insecticidal soap or neem oil to control them.
• Botrytis: This fungal disease can cause gray mold on the leaves and flowers. Remove infected plant parts and improve air circulation to prevent it.

Habitat

Streptocarpus is native to the tropical regions of Africa, where it grows in shaded areas of forests and woodlands. It prefers well-draining soil that is rich in organic matter, and it can grow in both humid and dry conditions.

Question and Answer

Q: Can Streptocarpus be grown outdoors?

A: Streptocarpus is not cold-tolerant and should be grown indoors or in a protected area outdoors.

Q: How often should I fertilize my Streptocarpus?

A: Fertilize the plant once a month during the growing season with a balanced, water-soluble fertilizer. Avoid fertilizing during the winter months.

Q: Can I propagate Streptocarpus from cuttings?

A: Yes, Streptocarpus can be propagated from leaf cuttings. Simply cut a leaf and its petiole, and place it in moist soil. Keep the soil moist and warm, and roots should form in a few weeks.

Q: Why are the leaves of my Streptocarpus turning yellow?

A: Yellowing leaves can be a sign of overwatering or underwatering. Make sure the soil is moist but not waterlogged, and adjust your watering schedule accordingly.

Related Plants

• Gloxinia
• African violet
• Primrose
• Cape primrose

References

• “Streptocarpus.” Missouri Botanical Garden, www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=b568.
• “Streptocarpus.” Royal Horticultural Society, www.rhs.org.uk/plants/17632/streptocarpus/details.
• “Streptocarpus.” The Spruce, www.thespruce.com/grow-streptocarpus-plants-1902489.