Diosma

Description

Diosma is a genus of flowering shrubs from the Rutaceae family, native to South Africa. These plants are also known as “breath of heaven” due to their fragrant leaves that release a pleasant scent when crushed. Diosma shrubs are usually small, reaching up to 3 feet in height and width. They are valued for their aromatic foliage, which is often used in potpourri and other fragrant products.

Taxonomic Information

Appearance

Diosma shrubs have small, glossy leaves that are usually lance-shaped and about 1 inch long. They are evergreen and usually stay green all year round. The leaves of the shrub release a pleasant fragrance when they are crushed, which is why they are often used in potpourri and other fragrant products. The flowers of Diosma plants are small and white or pink, usually appearing in clusters in the spring and summer. The shrub’s bark is usually grayish-brown and smooth.

Care Guide

Water

Diosma shrubs require regular watering, especially during the growing season. It is important to keep the soil moist but not waterlogged, as too much water can cause root rot. Water the plant deeply once a week, or more often if the weather is hot and dry.

Fertilization

Diosma shrubs benefit from regular fertilization during the growing season. Use a balanced, slow-release fertilizer in the spring, and again in mid-summer. Follow the package instructions for dosage and application.

Soil

Diosma shrubs prefer well-draining soil that is slightly acidic. If your soil is heavy, amend it with compost or other organic matter to improve drainage.

Sunlight

Diosma shrubs require full sun to partial shade to grow and bloom properly. They can tolerate some shade, but too much shade can cause the plant to become leggy and weak.

Hardiness Zones

Diosma shrubs are hardy in USDA zones 8-10. They can tolerate mild frost, but will require protection if temperatures drop below 25°F.

Common Pests & Diseases

Diosma shrubs are generally healthy and disease-resistant, but they can be susceptible to spider mites, scale insects, and mealybugs. These pests can be treated with insecticidal soap or horticultural oil. Diosma plants can also be affected by root rot if the soil is too wet.

Habitat

Diosma shrubs are native to South Africa, where they grow in a variety of habitats, including fynbos, grasslands, and shrublands. They are often found growing on sandy or rocky soils, and can be found at elevations of up to 5,000 feet.

Question and Answer

Q: Can Diosma shrubs be grown in containers?

A: Yes, Diosma shrubs can be grown in containers, as long as the container is large enough to accommodate the plant’s root system. Use a well-draining potting mix and water the plant regularly.

Q: How often should I prune my Diosma shrub?

A: Diosma shrubs can be pruned in the early spring to shape the plant and remove any dead or damaged branches. They can also be lightly pruned throughout the growing season to encourage bushier growth.

Q: How can I propagate Diosma plants?

A: Diosma plants can be propagated from cuttings taken in the summer. Take a 4-6 inch cutting from the tip of a healthy branch, remove the lower leaves, and dip the cut end in rooting hormone. Plant the cutting in well-draining soil and keep it moist until roots form.

Q: Are Diosma shrubs toxic to pets?

A: There is no evidence to suggest that Diosma shrubs are toxic to pets, but ingesting large amounts of the plant could cause mild gastrointestinal upset.

Related Plants

• Coleonema
• Leucadendron
• Protea
• Erica
• Calluna

References

• “Diosma.” Wikipedia, Wikimedia Foundation, 12 Apr. 2021, https://en.wikipedia.org/wiki/Diosma.
• “Diosma.” Royal Horticultural Society, https://www.rhs.org.uk/plants/18736/diosma/details.
• “Diosma.” Missouri Botanical Garden, https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=d365.