Diascia

Description

Diascia is a genus of plants belonging to the Scrophulariaceae family. It is native to South Africa and includes around 70 species. Diascia is commonly known as twinspur due to the pair of spurs that protrude from the base of the flowers. The plant is a popular choice for gardeners due to its vibrant colors and ability to attract pollinators such as bees and butterflies.

Taxonomic Information

Appearance

Diascia plants range in size from 6 inches to 2 feet tall and have a spread of around 1 to 2 feet. The leaves are small, oval-shaped, and vary in color from green to grayish-green. The flowers are the main attraction of the plant and can be found in shades of pink, purple, red, and white. The flowers have a tubular shape and are around 1 inch long. The pair of spurs at the base of the flowers can be up to 1 inch long and give the plant its common name, twinspur.

Care Guide

Water

Diascia plants prefer to be kept consistently moist but not waterlogged. Water the plant when the top inch of soil feels dry to the touch. Avoid getting water on the leaves as this can lead to fungal diseases.

Fertilization

Fertilize Diascia plants with a balanced fertilizer every two weeks during the growing season. Avoid fertilizing during the winter months when the plant is dormant.

Soil

Diascia plants prefer well-draining soil that is rich in organic matter. A soil pH of 6.0 to 7.5 is ideal.

Sunlight

Diascia plants prefer full sun to partial shade. In hot climates, they benefit from afternoon shade.

Hardiness Zones

Diascia plants are hardy in USDA zones 9 to 11. In cooler climates, they can be grown as annuals.

Common Pests & Diseases

Pests

Diascia plants are relatively pest-free. However, they can occasionally be attacked by aphids, thrips, and spider mites. These pests can be controlled with insecticidal soap or neem oil.

Diseases

Diascia plants can be susceptible to fungal diseases such as powdery mildew and botrytis. These diseases can be avoided by providing good air circulation and avoiding overhead watering.

Habitat

Diascia plants are native to South Africa and are found in grasslands and rocky areas. They prefer well-draining soil and can tolerate drought.

Question and Answer

Q: Can Diascia plants be grown in containers?

A: Yes, Diascia plants are well-suited to container gardening. Make sure the container has drainage holes and use a well-draining potting mix.

Q: How often should I prune Diascia plants?

A: Deadhead spent flowers regularly to encourage blooming. Cut back the plant by one-third in late summer to promote bushier growth.

Q: Can Diascia plants be grown indoors?

A: Diascia plants prefer to be grown outdoors in full sun to partial shade. However, they can be grown indoors in a bright, sunny location.

Q: How can I propagate Diascia plants?

A: Diascia plants can be propagated by taking stem cuttings in late spring or early summer. Dip the cuttings in rooting hormone and plant them in a well-draining potting mix.

Related Plants

• Verbena
• Lobelia
• Salvia
• Phlox

References

• “Diascia.” Missouri Botanical Garden, www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=273690. Accessed 15 Oct. 2021.
• “Diascia.” Royal Horticultural Society, www.rhs.org.uk/plants/22357/diascia/details. Accessed 15 Oct. 2021.
• “Plant Profile: Diascia.” Fine Gardening, www.finegardening.com/article/plant-profile-diascia. Accessed 15 Oct. 2021.