Delosperma nubigenum – plant photoSource: Wikimedia CommonsKrzysztof Ziarnek, KenraizCC BY-SA 4.0

Delosperma nubigenum care guide

Delosperma nubigenum
Sunny rock gardens, gravel borders, dry walls, raised beds, containers, troughs, sunny slopes and the front of a drought-tolerant perennial border. Yes, if drainage is excellent

Delosperma nubigenum short overview

Delosperma nubigenum is a compact, mat-forming succulent perennial native to mountainous areas of South Africa. Its fleshy evergreen leaves may bronze in winter, while bright yellow, daisy-like flowers appear in late spring and early summer. In the United States it is especially useful for rock gardens, dry borders, containers and sunny slopes, provided the planting site has excellent drainage and is not waterlogged during winter.

Taxonomy

Taxonomic classification

Plant familyAizoaceae
GenusDelosperma
Plant groupAizoaceae
Plant typeEvergreen succulent perennial ground cover
OriginFree State and Lesotho, southern Africa
Accepted scientific nameDelosperma nubigenum
Quick overview

Delosperma nubigenum care guide

Key requirements
LightFull sun
WaterLow water once established
HardinessCold-hardy with dry winter drainage
SoilSandy or rocky, sharply drained soil
SizeUp to 4 inches × 12–24 inches
BloomLate spring to summer
HumidityAverage outdoor humidity is suitable; avoid stagnant, humid conditions combined with wet soil.
Soil pHSlightly acidic to slightly alkaline
Feeding needsLight feeding
Minimum temperatureAbout -20°F when established and kept dry; hardiness varies by site and drainage.
USDA zoneUSDA Zones 5–10; protection may be needed in colder or poorly drained locations.
Growth rateModerate once established

Light and placement

Give full sun, ideally with a south- or west-facing exposure and unobstructed light for most of the day. In hot climates, a little afternoon shade is acceptable if drainage remains excellent. Insufficient light causes looser growth and fewer flowers; excessive wetness at the roots, rather than strong sun itself, is the usual cause of decline.

Watering and humidity

Water deeply after planting, then wait until the soil is thoroughly dry before watering again. Once established, irrigate only during prolonged heat or drought. Reduce watering in fall and keep the crown comparatively dry through cold, wet winters; container plants need more frequent checks but should never sit in runoff.

Soil and growing medium

Use a sharply draining mineral soil or succulent mix containing grit, coarse sand, gravel or crushed rock. Sandy, rocky and moderately calcareous soils are suitable. Avoid heavy clay and sites that stay wet in winter. A mildly acidic to mildly alkaline reaction is tolerated, so drainage is generally more important than exact pH.

Feeding

Fertilizer is usually optional in fertile mineral soil. If growth is weak, apply a dilute, balanced or low-nitrogen succulent fertilizer once in spring and again only if needed. Do not feed freshly planted, drought-stressed or dormant plants, and avoid rich nitrogen-heavy fertilizer that can produce weak, lush growth.

Growth and habit

Forms a dense, low, slowly spreading mat from branching succulent stems. It can root where stems contact suitable soil, gradually filling open spaces without forming a tall canopy. Keep neighboring vigorous plants from overtopping it, because shade and retained moisture reduce performance.

Planting

Planting and repotting

Planting timeSpring after severe frost, or early fall in suitable climates
Planting depthPlant at the nursery soil level; do not bury the crown.
Spacing12–18 inches

Plant after the danger of severe frost has passed, or in early fall where roots can establish before winter. Set the crown at the same depth as in the nursery container. Space plants about 12–18 inches apart for a connected ground-cover mat, and water periodically during the first growing season while allowing the soil to dry between applications.

Repotting

Repot container plants in spring when the root ball has filled the pot or the mix has broken down. Move the plant into a pot only slightly larger, use a gritty succulent medium, and allow cut surfaces or disturbed roots to dry briefly before watering.

Practical tasks

Propagation and pruning

Propagation

Propagate from stem cuttings in spring or early summer by allowing cut ends to dry briefly, then rooting them in a gritty, barely moist medium. Seed propagation is possible, but seedlings may be slower and less uniform than cuttings. Keep newly rooted pieces lightly watered until established.

Pruning

Little pruning is required. In spring, remove winter-damaged or dead material and lightly trim straggling stems to maintain an even mat. Avoid cutting deeply into old, leafless tissue unless healthy green nodes remain below the cut.

Seasonal care

Overwintering

This species can remain outdoors in much of the United States when planted in very well-drained soil. In colder regions, protect the crown from repeated winter wetness with a rain-shadow placement, raised bed or gravel mulch that does not cover the stems. Container plants are more vulnerable to root freezing and should be sheltered from prolonged saturation.

Practical use

Uses

Use as a drought-tolerant ground cover, rock-garden accent, gravel-border plant, wall or trough plant, and low edging for sunny beds. Its spreading habit can help soften hardscape edges and stabilize small dry slopes. It is ornamental rather than a documented culinary or medicinal crop.

Identification and habit

Appearance

The plant has closely packed, smooth, fleshy leaves on branching, low stems. It remains evergreen in suitable climates and may develop bronze tones during winter. The compact succulent foliage and bright yellow flowers distinguish it from taller, looser ice-plant species.

Flowering

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Flower colors
Bright yellow
Flower form
Daisy-like flowersFlower form
ScentNo notable scent documented
Flower sizeSmall

Small, bright yellow, daisy-like flowers are produced above the low foliage in late spring and may continue intermittently into summer. Flowers open most fully in bright sunshine and close or become less conspicuous during dull weather or at night.

Ecological relationships

Pollination and visitors

The open yellow flowers can provide accessible nectar and pollen for small bees and other flower-visiting insects, but a species-specific principal pollinator was not reliably documented. Visitor activity is expected mainly during sunny flowering periods.

Plant protection

Diseases and pests

Diseases

The main risk is root or crown rot caused by persistently wet soil, especially in cold weather. Plant on a raised or sloping site, avoid overhead irrigation, and remove damaged material. Good air circulation and fast drainage are usually more effective than routine fungicide use.

Pests

Watch for mealybugs, scale and occasional slugs in damp conditions. Inspect leaf axils and container rims, remove pests by hand or with a targeted treatment, and correct excessive moisture. Avoid keeping the plant crowded or continuously shaded.

Safety and allergens

Toxicity and pollen

ToxicityNo reliable species-specific toxicity classification found

No reliable species-specific toxicology evidence was found in the authoritative sources checked. Do not assume complete safety from the absence of reports. Prevent children and pets from consuming unfamiliar plant material, and seek veterinary or medical advice if ingestion causes symptoms.

Pollen and allergyUnknown to low airborne allergy concern
Typical season
Late spring through summer during flowering
Pollination / pollen
Flower pollen, mainly insect-transferred

This is an insect-pollinated flowering plant, and its pollen is generally presented at the flower rather than dispersed in large airborne clouds. However, species-specific clinical allergy data were not located, so sensitive individuals should avoid assuming zero risk during bloom.

Dogs No documented species-specific toxicity found; evidence limited.
Cats No documented species-specific toxicity found; evidence limited.
Children No documented species-specific toxicity found; prevent ingestion.
Affected plant parts All parts should be treated as unverified for consumption.
Natural environment

Native habitat

In nature it occurs in mountainous parts of the Free State and Lesotho, in temperate upland environments with strong light, seasonal cold and soils that drain rapidly. Its cultivated tolerance of frost depends heavily on keeping the crown and roots from remaining waterlogged.

Good to know

Interesting fact

This species is accepted under the name Delosperma nubigenum. It is native to the Free State and Lesotho. Its foliage can bronze during winter. It is regarded as one of the more cold-hardy cultivated ice plants.

Questions and answers

Frequently asked questions (FAQ)

32 questions

The most relevant questions about this plant, with short and direct answers.

🌱Quick care

What is Delosperma nubigenum?

Delosperma nubigenum is a low-growing, mat-forming succulent perennial in the Aizoaceae family. It is valued as a drought-tolerant ground cover with fleshy green leaves and yellow, daisy-like flowers.

How much sun does Delosperma nubigenum need?

Delosperma nubigenum grows best in full sun, ideally with at least 6 hours of direct sunlight daily. It can tolerate some partial shade, but reduced light may limit flowering and produce looser growth.

How often should I water Delosperma nubigenum?

Water Delosperma nubigenum sparingly once established, allowing the soil to dry between waterings. The plant is drought tolerant, but occasional watering during prolonged hot, dry periods can support better growth.

How big does Delosperma nubigenum get?

Delosperma nubigenum usually grows about 2 to 3 inches tall and spreads roughly 12 to 24 inches, sometimes farther in favorable conditions. Its horizontal growth makes it useful as a low ground cover.

Is Delosperma nubigenum evergreen?

Delosperma nubigenum is often evergreen or semi-evergreen in mild climates. In colder areas, its foliage may bronze or redden in fall and suffer some winter dieback.

🌤️Environment and placement

What USDA hardiness zones can grow Delosperma nubigenum?

Published hardiness ratings vary, but Delosperma nubigenum is commonly listed for approximately USDA Zones 4 or 5 through 8 or 9. Winter survival depends heavily on drainage, snow cover, exposure, and local temperatures.

Can Delosperma nubigenum survive cold winters?

Yes, Delosperma nubigenum is one of the more cold-hardy cultivated ice plants when grown in sharply drained soil. Cold, wet winter conditions are more dangerous than freezing temperatures alone.

Where should I plant Delosperma nubigenum outdoors?

Plant Delosperma nubigenum in a sunny rock garden, raised bed, gravel garden, slope, border edge, or other site with rapid drainage. Avoid low spots where rain or melting snow can remain around the roots.

Can Delosperma nubigenum grow in containers?

Yes, Delosperma nubigenum grows well in containers with drainage holes and a gritty, fast-draining mix. Choose a container that is wider than it is deep and protect it from prolonged winter saturation.

Is Delosperma nubigenum drought tolerant?

Yes, Delosperma nubigenum is drought tolerant after it establishes a healthy root system. Newly planted specimens still need occasional watering while roots develop.

Is Delosperma nubigenum salt tolerant?

Delosperma nubigenum has moderate salt tolerance and may perform well in some exposed or roadside settings. It should still be protected from repeated heavy applications of deicing salt.

💧Care and problems

What soil is best for Delosperma nubigenum?

Use sandy, rocky, or gritty soil that drains sharply and dries fairly quickly. Heavy clay or soil rich in moisture-retaining organic matter can increase the risk of crown and root rot.

Why is my Delosperma nubigenum turning red?

Red or bronze foliage is often a normal response to cool temperatures and seasonal change. Persistent discoloration combined with soft, collapsing leaves may instead indicate excess moisture or root problems.

Why is my Delosperma nubigenum dying after winter?

The most common concern is winter moisture around the crown or roots rather than cold alone. Improve drainage, avoid organic mulch that holds moisture, and keep the plant from sitting under melting snow or runoff.

What problems affect Delosperma nubigenum?

Delosperma nubigenum generally has few serious pest or disease problems. Aphids, mealybugs, crown rot, and root rot can occur, especially when plants are stressed or grown in damp, poorly drained soil.

Does Delosperma nubigenum need fertilizer?

Delosperma nubigenum usually needs little fertilizer when grown in moderately fertile soil. If growth is weak, apply a light, balanced fertilizer in spring rather than using frequent high-nitrogen feedings.

Should I mulch Delosperma nubigenum?

Use only a thin layer of inorganic mulch such as pea gravel around Delosperma nubigenum. Wood or bark mulch can hold too much moisture against the crown and may worsen winter losses.

🪴Planting and repotting

When is the best time to plant Delosperma nubigenum?

Spring is generally the safest planting time in colder parts of the United States because roots can establish before winter. In hot, dry regions, fall planting can also work if the plant has time to root before extreme weather.

How far apart should I plant Delosperma nubigenum?

Space Delosperma nubigenum about 10 to 14 inches apart for relatively quick ground cover. Wider spacing is acceptable if you prefer slower filling and better air circulation.

How do I plant Delosperma nubigenum in clay soil?

Amend the planting area for drainage or use a raised bed, rock garden, or container instead of planting directly into heavy clay. Avoid creating a rich, water-holding pocket that stays wetter than the surrounding soil.

Can Delosperma nubigenum grow between stepping stones?

Yes, Delosperma nubigenum can grow between stepping stones if the site receives strong sunlight and has excellent drainage. Leave enough space for its spreading mat and avoid areas with frequent standing water.

Should I repot Delosperma nubigenum?

Repot container-grown Delosperma nubigenum when the plant has filled its container or the mix has become compacted, often about every two years. Use fresh gritty soil and move it into a slightly wider pot with drainage holes.

✂️Propagation and pruning

How do I propagate Delosperma nubigenum from cuttings?

Take healthy stem cuttings about 2 to 5 inches long in spring or summer, remove the lower leaves, and place the stems in a sandy, well-drained mix. Keep the medium only lightly moist until roots form.

Can Delosperma nubigenum be grown from seed?

Yes, Delosperma nubigenum can be propagated from seed, although cuttings are often the simpler way to produce matching plants. Sow the seed in a well-drained medium and avoid keeping it constantly wet.

Can I divide Delosperma nubigenum?

Established mats can sometimes be separated into rooted sections, although stem cuttings are the more consistently documented propagation method. Replant divisions in gritty soil and water lightly until they recover.

Does Delosperma nubigenum need pruning?

Delosperma nubigenum needs very little pruning. Remove dead or damaged growth, trim stray stems to maintain the mat’s shape, and clear winter debris without cutting away healthy new growth.

How do I keep Delosperma nubigenum from spreading too far?

Trim wandering stems back to the desired boundary and remove rooted pieces that extend beyond the planting area. Regular edge trimming is usually enough because the plant spreads as a low, horizontal mat.

⚠️Toxicity and safety

Is Delosperma nubigenum toxic to dogs or cats?

No reliable species-specific toxicity classification was found for Delosperma nubigenum. Because toxicity data are limited, prevent pets and children from eating the plant and contact a veterinarian or poison-control service if ingestion occurs.

🌸Flowering and special interest

When does Delosperma nubigenum bloom?

Delosperma nubigenum typically blooms from late spring into summer, with some plants flowering intermittently later in the season. Bloom timing varies with sunlight, temperature, and regional climate.

What color are Delosperma nubigenum flowers?

Delosperma nubigenum produces bright yellow to chartreuse-yellow, daisy-like flowers. The flowers appear above the low succulent foliage and can cover much of the mat during peak bloom.

Why is my Delosperma nubigenum not flowering?

Insufficient sunlight, excessive moisture, immature growth, or unsuitable winter conditions can reduce flowering. Move container plants to full sun and avoid heavy fertilizer or persistently wet soil.

Does Delosperma nubigenum attract pollinators?

Yes, the yellow flowers of Delosperma nubigenum can attract bees and butterflies. Planting several specimens together can create a more noticeable flowering display for pollinators.

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Verifiability

Sources and data reliability

88% overall; exact species-level toxicity, pollen and pollinator evidence is limited.