Pleiospilos nelii
Pleiospilos neliiUSDA | Grow Zone
9-11Outdoors all year in zones 9 to 11. Anywhere colder, keep it as a houseplant. Protect it below 40°F.
- Light
- Full sun, 6 hours daily
- Water
- Every 2-3 weeks
- Humidity
- 30-50%
- Temperature
- 70-85°F (21-29°C)
- Difficulty
- Beginner
- Growth
- Slow
- Mature size
- 6-12 in tall, 12-18 in wide
- Pets
- Non-toxic to pets and children
Pleiospilos nelii, known for its unique appearance resembling split rocks, is a captivating succulent native to South Africa. This resilient plant thrives in bright sunlight and requires minimal care, making it a favorite among succulent enthusiasts.
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Ideal temperature
50-85°F is where it grows fastest. Below 40°F cold damage starts.
Spacing and harvest
- Mature size
- 6-12 in tall, 12-18 in wide
- Plant apart
- 12-18 in
- Frost
- Half hardy: light frost only
Everything it needs
9 essentials at a glance
Watering
Pleiospilos nelii prefers to dry out completely between waterings.
During the growing season (spring and summer), water every 2-3 weeks, ensuring the soil is thoroughly soaked. In fall and winter, reduce watering to once a month or less, depending on humidity levels. Signs of over-watering include mushy stems and yellowing leaves, while under-watering may cause shriveling and wrinkling of the leaves.
Light
This plant thrives in full sun, ideally receiving at least 6 hours of direct sunlight daily.
A south-facing window or a bright outdoor spot is perfect for Pleiospilos nelii. It can tolerate some partial shade, especially in extremely hot climates, but too much shade can lead to leggy growth and poor flowering.
Soil
Pleiospilos nelii requires well-draining soil, ideally a cactus or succulent mix with added perlite or sand for improved drainage.
The pH should be slightly acidic to neutral, around 6.0 to 7.0. Ensure the pot has drainage holes to prevent water retention, which can lead to root rot.
Humidity
This succulent prefers low humidity levels, ideally around 30-50%.
To increase humidity, you can place a humidity tray filled with water near the plant or mist occasionally, though excessive misting should be avoided. Signs of humidity stress include shriveling leaves and stunted growth.
Temperature
Pleiospilos nelii thrives in temperatures between 70-85°F (21-29°C) during the day and can tolerate nighttime temperatures down to 50°F (10°C).
It is hardy in USDA zones 9-11, but should be protected from frost and extreme cold. In summer, it can handle higher temperatures but should be shaded during the hottest part of the day.
Fertilizing
Use a diluted cactus fertilizer with an NPK ratio of 10-10-10 or similar, applying every 4-6 weeks during the growing season.
In fall and winter, refrain from fertilizing as the plant goes dormant. Signs of nutrient deficiency include stunted growth and pale leaves.
Pruning
Pruning is minimal for Pleiospilos nelii.
Remove any dead or damaged leaves as needed, using clean, sharp scissors. This plant does not require shaping, but if it becomes leggy, you can trim back to encourage bushier growth.
Repotting
Repotting should be done every 2-3 years or when the plant outgrows its pot.
Choose a pot that is 1-2 inches larger in diameter. Signs it needs repotting include roots growing out of the drainage holes or stunted growth. To repot, gently remove the plant from its pot, shake off excess soil, and place it in fresh soil in the new pot.
Propagation
Propagation can be done through leaf cuttings or offsets.
For leaf cuttings, take a healthy leaf, allow it to callous over for a few days, then plant it in well-draining soil. Offsets can be gently removed from the parent plant and replanted. The best time for propagation is during the growing season in spring or early summer.
When it's unhappy
Yellow leaves
Why it happens
Usually caused by over-watering or poor drainage.
How to fix it
Reduce watering frequency and ensure the pot has adequate drainage.
Shriveling leaves
Why it happens
Indicates under-watering or insufficient humidity.
How to fix it
Increase watering frequency and check humidity levels.
Leggy growth
Why it happens
Occurs when the plant does not receive enough light.
How to fix it
Move the plant to a brighter location with more direct sunlight.
Root rot
Why it happens
Caused by prolonged exposure to wet soil.
How to fix it
Remove the plant from the pot, cut away affected roots, and repot in fresh, dry soil.
Pest infestations (e.g., mealybugs)
Why it happens
Often due to high humidity or poor air circulation.
How to fix it
Treat with insecticidal soap or neem oil, and ensure good air circulation.
Care through the year
Spring
In spring, resume regular watering as the plant begins to grow. Fertilize every 4-6 weeks with a diluted cactus fertilizer to promote healthy growth.
Summer
During summer, ensure the plant receives full sun and monitor for signs of over-heating. Water every 2-3 weeks, allowing the soil to dry out completely between waterings.
Fall
In fall, gradually reduce watering as the plant prepares for dormancy. Fertilize sparingly, if at all, as growth slows down.
Winter
In winter, water only once a month or less, keeping the plant in a warm, dry location. Avoid fertilizing during this dormant period.
Toxicity & Safety
Pleiospilos nelii is considered non-toxic to pets and children. However, ingestion of any plant material may cause mild gastrointestinal upset. Always monitor children and pets around plants.
Good to know
How often should I water my Pleiospilos nelii?
Water your Pleiospilos nelii every 2-3 weeks during the growing season, allowing the soil to dry out completely between waterings.
What type of soil is best for Pleiospilos nelii?
A well-draining cactus or succulent mix is ideal for Pleiospilos nelii, with added perlite or sand to enhance drainage.
Why are my Pleiospilos nelii leaves turning yellow?
Yellow leaves typically indicate over-watering or poor drainage. Check the soil moisture and adjust your watering schedule accordingly.
Can I propagate Pleiospilos nelii from leaves?
Yes, you can propagate Pleiospilos nelii from leaf cuttings. Allow the cuttings to callous over before planting them in well-draining soil.
What light conditions does Pleiospilos nelii need?
Pleiospilos nelii thrives in full sun, requiring at least 6 hours of direct sunlight each day for optimal growth.
What temperature range is ideal for Pleiospilos nelii?
This plant prefers temperatures between 70-85°F (21-29°C) during the day, with a tolerance for cooler nights down to 50°F (10°C).
How do I know when to repot my Pleiospilos nelii?
Repot your Pleiospilos nelii every 2-3 years or when you notice roots growing out of the drainage holes or stunted growth.
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