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Learn about Delosperma

Delosperma: Potted Plant Perennial

How to Plant

Planting Potted Plants:

  • Choose a location in full sun with well-drained soil. Drainage is very important for delosperma and the plant will not thrive in poorly drained clay soils.
  • Prepare the bed by turning the soil under to a depth of 6-12 inches removing any debris, and lightly raking as level as possible.
  • The addition of organic matter (leaf mold, compost, well-rotted manure) benefits all gardens and is essential in recently constructed neighborhoods.
  • Plant on a cloudy day or in late afternoon to reduce transplant shock.
  • Dig a hole for each plant large enough to amply accommodate the root ball.  
  • Unpot the plant and gently loosen the root ball with your hands to encourage good root growth.  
  • Place the top of the root ball even with the level of the surrounding soil. Fill with soil to the top of the root ball. Press soil down firmly with your hand.  
  • Use the plant tag as a location marker.  
  • Thoroughly water and apply a light mulch layer on top of the soil (1-2 inches) to conserve water and reduce weeds.

How to Grow

  • Keep weeds under control during the growing season. Weeds compete with plants for water, space and nutrients, so control them by either cultivating often or use a mulch to prevent their germination.  
  • Mulches also help retain soil moisture and maintain even soil temperatures. For perennials, an organic mulch of aged bark or shredded leaves lends a natural look to the bed and will improve the soil as it breaks down in time.  Always keep mulches off a plant’s stems to prevent possible rot.
  • Careful watering is essential in getting perennials off to a good start. Water thoroughly at least once a week to help new roots grow down deeply. Soil should be damp at about 1 inch below the soil surface. You can check this by sticking your finger in the soil. Water early in the morning to give all leaves enough time to dry. After delosperma becomes established, water sparingly as this is sensitive to wet soils.
  • Until plants become established, some protection from extreme winds and direct, hot sunlight may be necessary.  Good air movement is also important.
  • After new growth appears, a light fertilizer may be applied. Keep granular fertilizers away from the plant crown and foliage to avoid burn injury. Use low rates of a slow release fertilizer such as Garden-tone, as higher rates may encourage root rots.
  • In colder regions, apply another layer of mulch (1-2 inches) after the ground freezes in fall. Evergreen boughs (from Christmas trees) provide additional protection. Remove this mulch in the spring.

Growing Tips

  • South African plants are very heat and drought tolerant.
  • Delosperma makes a succulent, mat-forming ground cover covered with brilliant color.
  • In warmer climates, delosperma may be evergreen.
  • You can propagate plants from cuttings. Take a cutting from a stem without a flower on it, strip off the leaves and replant in loose soil.

Common Disease Problems

Botrytis: This fungus causes a grey mold on flowers, leaves, stems and buds. It thrives in cool wet weather conditions. Burpee Recommends: Remove affected plant parts, avoid watering at night and getting water on the plant when watering. Make sure plants have good air circulation. Contact your Cooperative Extension Service for fungicide recommendations. 

Crown and Root Rots: A number of pathogens cause crown and root rots. Burpee Recommends: Make sure your soil has excellent drainage. Avoid over watering.

Fusarium Wilt: Plants wilt but are not suffering from a crown or root rot disease. This fungus lives in the soil and blocks the water conducting tissues causing the plant to wilt. Burpee Recommends: Remove infected plants and do not plant in the same location. 

Sooty Mold: This is caused by a mold that grows on the honeydew excreted by aphids and other sucking insects. Burpee Recommends: Control for aphids or scale. The damage is cosmetic only. 

Verticillium Wilt: Plants wilt but are not suffering from a crown or root rot disease. This fungus lives in the soil and blocks the water conducting tissues causing the plant to wilt. Burpee Recommends: Remove infected plants and do not plant in the same location. 

Common Pest and Cultural Problems

Aphids: Greenish, red, black or peach colored sucking insects can spread disease as they feed on the undersides of leaves. They leave a sticky residue on foliage that attracts ants. Burpee Recommends: Introduce or attract natural predators into your garden such as lady beetles and wasps which feed on aphids. You can also wash them off with a strong spray, or use an insecticidal soap. 

Mealybugs: Mealybugs are 1/8 to ¼ inch long flat wingless insects that secrete a white powder that forms a waxy shell that protects them. They form cottony looking masses on stems, branches and leaves. They suck the juices from leaves and stems and cause weak growth. They also attract ants with the honeydew they excrete, and the honeydew can grow a black sooty mold on it as well. Burpee Recommends: Wash infected plant parts under the faucet and try to rub the bugs off. They may also be controlled by predator insects such as lacewings, ladybugs and parasitic wasps. Check with your Cooperative Extension Service for pesticide recommendations. 

Slugs: These pests leave large holes in the foliage or eat leaves entirely. They leave a slime trail, feed at night and are mostly a problem in damp weather. Burpee Recommends: Hand pick, at night if possible. You can try attracting the slugs to traps either using cornmeal or beer. For a beer trap, dig a hole in the ground and place a large cup or bowl into the hole; use something that has steep sides so that the slugs can’t crawl back out when they’re finished. Fill the bowl about ¾ of the way full with beer, and let it sit overnight. In the morning, the bowl should be full of drowned slugs that can be dumped out for the birds to eat. For a cornmeal trap, put a tablespoon or two of cornmeal in a jar and put it on its side near the plants. Slugs are attracted to the scent but they cannot digest it and it will kill them. You can also try placing a barrier around your plants of diatomaceous earth or even coffee grounds. They cannot crawl over these.

Spider Mites: These tiny spider-like pests are about the size of a grain of pepper. They may be red, black, brown or yellow. They suck on the plant juices removing chlorophyll and injecting toxins which cause white dots on the foliage. There is often webbing visible on the plant. They cause the foliage to turn yellow and become dry and stippled. They multiply quickly and thrive in dry conditions. Burpee Recommends: Spider mites may be controlled with a forceful spray every other day. Try hot pepper wax or insecticidal soap. Check with your Cooperative Extension Service for miticide recommendations. 

Vine Weevil: This insect cuts irregular notches in leaf margins and grubs feed on plant roots, sometimes causing the death of the plant. Adults are approximately 5/16 inch long, dull black with dirty yellow marking on the wing cases. The grubs are c-shaped, 3/8 inches long, with light brown heads. Burpee Recommends: Handpick adults at night, shake the plants over newspaper to dislodge them. Check under pots where they hide during the day. Check with your Cooperative Extension Service for pesticide recommendations. 

Delosperma FAQs

Is delosperma a good pollinator plant? Yes, it attracts butterflies.

Is delosperma deer resistant? Yes it does tend to be deer resistant.

Can I grow delosperma in a container? Yes, just make sure you have excellent drainage and a well-drained commercial soil mix.

Why do I have lush growth and no flowers? Delosperma blooms best in poor soils in full sun. Make sure you do not over fertilize or over water.

My delosperma did not overwinter, what was wrong? Delosperma is susceptible to rotting over the winter in poorly drained locations, and may need extra protection in zones 5 and 6. You can try bringing it inside if you have a bright sunny location.

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