Pleiospilos nelii — a hard houseplant, prefers full sun light
SPECIMEN · FROM THE LIBRARY
Pleiospilos nelii

Pleiospilos Nelii

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ON THIS PLANT

Pleiospilos nelii, commonly known as the split rock plant, is a succulent native to South Africa. This small plant reaches up to 10 cm in height and 15 cm in diameter. Its thick, fleshy leaves form a pair of symmetrical halves, resembling two rocks split down the middle.

In late summer or early fall, the split rock plant blooms with beautiful yellow or white flowers. These daisy-like blossoms, with numerous petals, can grow up to 5 cm in diameter.

An easy-to-care-for houseplant, Pleiospilos nelii requires minimal watering and can thrive even with some neglect. It prefers well-draining soil and bright sunlight but can also tolerate partial shade.

The unique appearance of Pleiospilos nelii makes it a captivating addition to any succulent collection or garden bed. Its low maintenance needs make it an ideal choice for beginners seeking easy-to-care-for plants with striking visual appeal.

A note from PlantMom

Split rock has moderate resistance to disease but is more sensitive to humidity. It tends to become diseased when humidity is high and is susceptible to root rot while dormant. Regarding care, Split rock tolerates drought yet requires increased watering during the growing season. Watering should be greatly reduced or stopped entirely during dormancy. Split rock is best suited to growers with some experience, as it can be challenging to maintain, especially during its dormant period. It is particularly appropriate for those who can dedicate time to its care in the winter months.

— PlantMom
CARE GUIDE

How to keep Pleiospilos Nelii.

Light

The split rock plant flourishes in strong sunlight, though it can also tolerate areas with less light. Native to environments where light is plentiful, it shows its best growth in those conditions. If exposed to extremes—either too much or too little sun—the plant may suffer health problems.

Water

The Split Rock plant thrives in arid conditions due to its high drought tolerance and efficient water storage. To care for this plant, water it every three weeks, ensuring the soil dries out completely between waterings. Using well-draining soil is essential to prevent overwatering and root rot. During its active growth and flowering phase, the plant will need more water than usual.

Humidity

This plant prefers dry conditions, so don't mist it. However, watering it less often can also thrive in higher humidity.

Temperature

Split rock naturally occurs in regions where temperatures range from 68 to 100 degrees Fahrenheit (20 to 38 degrees Celsius). It prefers warmer climates but can tolerate cooler winter temperatures if watered less.

Fertilizer

Split rock needs only light fertilizer applications once or twice a year during its active growing season. Do not fertilize in winter or summer when the plant is dormant. Cut back on fertilizer for plants that have been repotted and wait a couple of months after repotting before you start fertilizing. Fertilizing helps maintain healthy growth and encourages flowering.

Pruning

To keep split rock plants in good shape, it's important to prune them in the spring and autumn. This helps remove any unnecessary or crowded branches. If you want to propagate these plants, cut thick stems that have 5-6 leaves. Apply sulfur powder to the cut areas to protect them, and once the wounds have healed, plant the stems in soil that is slightly moist.

Pot & Repot

When repotting Split rock, choose a pot slightly larger than the current one with good drainage. Use a gritty, well-draining cactus or succulent mix. Gently remove the plant from its old pot, brush off excess soil, and replant it at the same depth. Wait a few days before watering to allow any root damage to heal. Repot in spring or fall and place it in a brightly lit spot.

CHARACTERISTICS

Botanical profile.

Plant Type
Succulent
Life Cycle
Perennial
Genus
Pleiospilos
Family
Aizoaceae
Hardiness Zone
9-11
Mature Height
5 cm to 8 cm
Mature Spread
10 cm
Leaf Color
Green, Silver, Gray
Leaf Type
Evergreen
Flower Color
Yellow, Orange
Flower Size
6.35 cm to 7.62 cm
Bloom Time
Early spring, Mid spring, Fall, Winter
Planting Time
Spring
Harvest Time
Spring, Mid fall, Late fall, Winter
Native Area
South Africa
ALSO KNOWN AS

Other names.

en Splitrock en Split rocks
FREQUENTLY ASKED

Reader questions.

What should I do if I give my Split rock too much water or too little water?

Split rock and other succulents can go without water for a long time, so it's rare to find one suffering from underwatering. However, if you forget to water your Split rock for a month or more, it may show signs of thirst or damage. An underwatered Split rock will look dull and wrinkled, and some parts may have dried up or turned brown. The soil will also be completely dried out. To remedy this, give your Split rock plenty of water by fully submerging the pot for 5-10 minutes. Once the soil feels moist on the surface, it means the watering is done correctly. On the other hand, overwatering is dangerous for a Split rock and can be fatal if not addressed. Too much moisture can cause root rot, which prevents the roots from absorbing nutrients and water. This occurs when wet conditions allow fungi and bacteria to thrive in the soil and feed on the roots. Overwatering symptoms include yellow, swollen, and translucent organs that may burst from water saturation. If left untreated, the plant may turn brown or black and lose leaves easily. Check the soil to confirm if overwatering is the cause, as similar symptoms can be caused by other issues. Saving an overwatered plant can be challenging but not impossible. Catching the issue early is crucial. If the roots are rotten, it may be too late to save the plant. To assess the roots, remove the plant from its pot and gently clean the wet soil from the roots with room-temperature water. This helps remove any lurking fungus and provides a better sense of root health. Dark brown or black, soft, mushy, or slimy roots indicate root rot. If most of the roots are affected, it may not be possible to save the plant. In this case, remove any healthy stems and attempt to propagate a new Split rock. However, if only some of the roots are affected, there is a chance of saving the plant. Remove unhealthy-looking roots with a sterilized cutting tool, and dip the remaining firm, pale roots in fungicide. Repot the Split rock in fresh, well-draining soil. While this doesn't always work, in most cases the plant will recover and start growing again in the next season.

Why is it necessary to put fertilizer on my Split rock?

Fertilizing Split rock is important for adding nutrients to the growing medium. While it already stores water and nutrients, applying plant food during the growing season further promotes healthy growth. Additionally, fertilizing can stimulate blooming in mature specimens during the growing season.

What are the sunlight requirements for a Split Rock plant?

Split Rock plants (Pleiospilos nelii) require a substantial amount of sunlight to thrive ideally. Full sun exposure, which means the plant should receive above 6 hours of direct sunlight daily, is preferred for optimal growth. However, these plants can also adapt to partial sun conditions, where they receive about 3-6 hours of direct sunlight. It's vital to observe the sunlight's movement in your garden to ensure you choose a location that provides the right balance of light and shade, which is critical for the health and happiness of your plants.

What is the ideal temperature range for Split rock?

Split rock flourishes in temperatures ranging from 68 to 100 degrees Fahrenheit (20 to 38 degrees Celsius), favoring warmer climates. However, it can adapt to cooler temperatures during winter by reducing water intake. Its growth slows, and it enters a dormant state in colder conditions, requiring less water to prevent root rot. When temperatures drop below 68°F (20°C), watering should be minimized or halted, especially for plants grown outdoors. For indoor cultivation during cold weather, it's recommended to place the plant near a south-facing window for maximum sunlight exposure, using supplemental lighting if necessary.

How many times a week should I water my Split rock plant?

Determining how often to water Split Rock can be subjective, but there are some guidelines to follow. Start by checking the soil and only watering when it is completely dry. You can use your finger or a moisture meter to assess the soil's moisture level. If you have a deep pot, you can also check the soil with a stick or chopstick. If it feels slightly damp, wait a few days and check again. In general, watering Split Rock every two weeks in summer and once a month in winter works for most people. However, there are factors that may alter this schedule. The following section provides some considerations that can help you determine the appropriate watering frequency.

When should I put fertilizer on my Split rock?

Split rock, unlike other plants, only requires a small amount of fertilizer during the growing season. To maintain its health, it is recommended to fertilize this plant 1-2 times per year. Ideally, fertilization should be done in spring and autumn, avoiding the winter and summer seasons when the plant is dormant. When repotting the plant, be cautious and decrease the amount of fertilizer used. It is also advisable to wait a few months after repotting before beginning to fertilize the plant.

Can Split Rock plants grow under artificial lighting?

Yes, Split Rock plants can grow under artificial lighting, which becomes particularly useful in scenarios where natural sunlight is insufficient, such as during winter or in darker indoor spaces. Artificial lighting, like LED lights, can be tailored to provide the specific wavelengths of light the plants need. Full sun plants typically require 30-50W/sq ft of artificial light, while partial sun plants need about 20-30W/sq ft. It's important to position the light source 12-36 inches above the plants to mimic natural sunlight effectively and to ensure the lights are on for 8-12 hours per day to match the plant's natural daylight exposure needs.

How should Split rock be cared for in low temperatures?

During low temperatures, particularly when it dips below 20°C, Split rock's growth can be negatively affected. The plant struggles in temperatures below 0°C and may experience wilting, weakness, and root rot if exposed to temperatures below -5°C. After mild frost damage, symptoms might not appear immediately but expect gradual wilting over a week. To care for a Split rock in such conditions, trim off frostbitten areas while checking for root rot. If roots are damaged, remove them and propagate from healthy cuttings. Ensuring the plant is moved to a warmer indoor setting with ample sunlight, preferably near a south-facing window, is crucial. Supplemental lighting can be used if natural light is insufficient.

What things do I need to think about when watering my Split rock?

Watering your Split rock effectively depends on several environmental factors. The size of the container and type of soil used will determine the frequency and amount of water needed. Ensure that the container has proper drainage to avoid overwatering. Smaller containers hold less moisture, while larger ones retain water longer. Repot to a container only slightly larger than the current one, preferably a shallow one for the plant's shallow root system. In terms of season, Split rocks require less watering during winter when growth is slower and evaporation is lower. The soil remains wet for longer in the cooler air. Additionally, consider the climate of your location. Humid areas with frequent rain require less watering compared to dry and arid climates. Note that conditions can vary within the same location depending on the season and indoor heating or air conditioning usage. For outdoor planting, Split rocks planted in the ground usually do not need additional watering beyond natural precipitation and dew. However, during extended dry periods, occasional watering may be necessary. If the plant is grown in a container, it can be moved outside during spring and summer, provided the temperature is suitable, and brought indoors when temperatures drop. Keep in mind that potted Split rocks kept outside will generally need more water due to increased sun exposure, even if placed on a shaded porch.

When should I not put fertilizer on my Split rock?

Split rock, like other plants, experiences a dormancy period, during which it is best to halt fertilizer application. This period occurs in both summer and winter, when the plant stops growing. Additionally, it is advisable to refrain from fertilizing for a few months after repotting in the spring.

What symptoms indicate a Split Rock plant is receiving inadequate light?

Split Rock plants show several symptoms when they are not receiving enough light, which is crucial for their development. Some common signs include smaller new leaves, leggy or sparse growth, faster leaf drop, slower or halted growth, and lighter-colored new leaves. These symptoms suggest that the plant is struggling due to insufficient sunlight, which can lead to a decreased ability to photosynthesize and ultimately affect the plant's overall health and growth.

What should be done if Split rock experiences high temperatures?

In high temperatures, particularly above 100°F (38°C), care should be taken to ensure Split rock's survival. The plant's growth halts, and it may suffer from water loss, wilting, and increased susceptibility to sunburn if the temperature exceeds 109°F (43°C). To mitigate high temperature stress, remove any sunburned or rotten parts and shield the plant from direct afternoon sunlight until it shows signs of recovery and growth. If the plant has root rot, cease watering until new roots develop.

PLATES
Pleiospilos nelii leaf
PLATE 01 · leaf
Pleiospilos nelii leaf
PLATE 02 · leaf
Pleiospilos nelii flower
PLATE 03 · flower
Pleiospilos nelii flower
PLATE 04 · flower
Pleiospilos nelii bark
PLATE 05 · bark
Pleiospilos nelii bark
PLATE 06 · bark
ALSO IN THE LIBRARY

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