Mesembryanthemum crystallinum — a hard houseplant, prefers full sun light
SPECIMEN · FROM THE LIBRARY
Mesembryanthemum crystallinum

Mesembryanthemum Crystallinum

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ON THIS PLANT

Mesembryanthemum crystallinum is a prostrate succulent plant native to Africa, Sinai and southern Europe, and naturalized in the New World. The plant is covered with large, glistening bladder cells or water vesicles, reflected in its common names of common ice plant, crystalline ice plant or ice plant.

A note from PlantMom

The common ice plant has moderate disease resistance and is relatively sensitive to humidity. It is prone to illness when humidity is high and can develop root rot during dormancy. In terms of care, the common ice plant is drought-tolerant but requires more water during the active growing season. Watering should be greatly reduced or stopped entirely while it is dormant. The common ice plant is suitable for growers with some experience, though it can be challenging to care for, particularly during dormancy. It is especially appropriate for people who can dedicate time to its care throughout the winter months.

— PlantMom
CARE GUIDE

How to keep Mesembryanthemum Crystallinum.

Light

The common ice plant comes from regions with intense sunlight and is used to receiving very high light levels throughout the day. It does well under these conditions, showing strong, healthy growth. Both too much and too little light can interfere with the plant's optimal development. Therefore, its need for abundant light is an important factor to consider in its cultivation.

Water

The common ice plant is well-suited to dry conditions and demonstrates exceptional drought tolerance. It thrives with minimal moisture, needing only to be watered every three weeks. The plant prefers full sun, making it an excellent choice for xeriscaping. During its active season, it provides lush ground cover.

Temperature

Native to temperate regions, the common ice plant performs best at temperatures of 68 to 100 °F (20 to 38 ℃). This preferred temperature range emphasizes the plant’s hardy nature. For care, simply adjust its heat exposure as the seasons change.

Fertilizer

For Common ice plant, light applications of fertilizer 1-2 times a year during the growing season are adequate. Do not fertilize in winter or in summer when the plant is dormant. Cut back on fertilizer for recently repotted plants and wait a couple of months after repotting before applying fertilizer. Fertilizing helps maintain healthy growth and promotes blooms.

Pruning

To preserve the shape of a common ice plant, prune any redundant or dense branches during the spring and autumn. Use tools like knives and scissors for this task, and apply sulfur powder to any cuts. When propagating, select sturdy stems with 5-6 leaves. Cut these stems, treat the wound with sulfur powder, and allow it to heal before planting. Ensure the soil is slightly moist for the cuttings.

Pot & Repot

Repot the common ice plant every two years in the spring, using a slightly larger pot with good drainage. Place it in a spot with bright light, but avoid direct midday sun. Water sparingly to encourage healthy growth, keeping in mind that it functions as a succulent ground cover.

CHARACTERISTICS

Botanical profile.

Plant Type
Herb
Life Cycle
Annual, Perennial, Biennial
Genus
Mesembryanthemum
Family
Aizoaceae
Hardiness Zone
10-11
Mature Height
20 cm
Mature Spread
40 cm
Leaf Color
Green, Gray, Red
Leaf Type
Semi-evergreen
Flower Color
White, Pink
Flower Size
3.05 cm to 5.08 cm
Bloom Time
Early spring, Mid spring, Fall, Winter
Planting Time
Spring, Summer
Harvest Time
Spring, Mid fall, Late fall, Winter
Native Area
Saudi Arabia, Libya, Egypt, Tunisia, South Africa, Namibia, Mauritania, Cyprus, Greece, Croatia, Morocco, Italy, Spain, Israel, Algeria, France
ALSO KNOWN AS

Other names.

en Common iceplant en Crystalline iceplant en Iceplant en Common ice plant en Crystalline ice plant en Barilla
FREQUENTLY ASKED

Reader questions.

What should I do if I give my Common ice plant too much water or not enough water?

The Common ice plant and other succulents are able to endure long periods without water, so it is unusual to find one suffering from underwatering. However, if the plant goes without water for a month or more, it may appear thirsty or show signs of damage. An underwatered Common ice plant will look lacklustre and wrinkled, with some plants drying up completely, turning brown and crispy, or dropping off. The soil will also be completely dried out. To remedy this, give the plant plenty of water by submerging the pot entirely in water for 5-10 minutes. Once the soil feels moist on the surface, the watering is done properly. On the other hand, overwatering is dangerous for Common ice plants and can be fatal if not addressed. Too much moisture leads to root rot, which prevents the roots from absorbing nutrients and water from the soil. Root rot occurs when wet conditions allow fungi and bacteria to thrive in the soil and feed on the roots. Symptoms of overwatering include yellow, swollen, and translucent organs that may burst open from being over waterlogged. If left untreated, the plant may turn brown or black and fall off easily. Check the soil to determine if overwatering is the issue. Saving an overwatered plant can be challenging, but catching it early is key. If the roots have rotted, it may kill the entire plant. To check, remove the plant from its pot and gently remove wet soil from around the roots. Rinse the roots in room-temperature water to remove any fungus and assess their health. Dark brown or black, soft, mushy, or slimy roots indicate root rot. If most of the roots are affected, the plant may not be salvageable. If only a portion of the roots have rot, there is a chance to save the plant. Use a sterilized cutting tool to remove any unhealthy roots and dip the remaining firm, pale roots in a fungicide. Repot the plant in fresh, well-draining soil. While this method does not always work, in most cases the plant will recover and produce new growth in the next growing season.

Why should I put fertilizer on my Common ice plant?

Fertilizing Common ice plant helps provide nutrients to the growing medium. Even though it already stores water and nutrients, applying plant food during the growing season supports healthy growth. Additionally, fertilizing can stimulate mature specimens to produce blooms in the growing season.

What are the sunlight requirements for the Common ice plant?

The Common ice plant, or Mesembryanthemum crystallinum, thrives in areas with strong sunlight. It requires more than 6 hours of sunlight per day for full sun conditions, and about 3-6 hours of sunlight for partial sun conditions. Ensuring the plant receives the right balance of light and shade is crucial for its optimal growth, as both over and underexposure to light can impede its development. The plant's natural habitat has conditioned it to withstand an environment abundant in light throughout the day, making its need for abundant light a critical factor in its growth process.

What is the optimal temperature range for Common Ice Plant?

The Common Ice Plant (Mesembryanthemum crystallinum) thrives best in temperate climates, with an optimal temperature range between 68 to 100°F (20 to 38°C). This preference underscores the plant's resilience and its ability to adapt to seasonal temperature variations. To care for the plant properly, it's important to adjust its heat exposure based on the ambient temperature. During colder months, when the temperature falls below 5°C, the plant should ideally be moved indoors to continue its cultivation near a south-facing window for optimal sunlight. If sunlight is scarce, supplemental lighting can be considered to ensure the plant's growth doesn't stagnate. In the event the temperature drops below 20°C, it's advisable to lessen or entirely stop watering to prevent root rot, and for those cultivated outdoors, cease watering during cold snaps.

How often do I need to water my Common ice plant?

To determine how often to water Common ice plant, it is best to check the soil and only water when it is completely dry. You can test the soil by using your finger or a moisture meter, especially if it is planted in a deep pot. If the soil feels even slightly moist, give it a few more days and check again. Typically, Common ice plant should be watered every two weeks in summer and once a month in winter, but there are factors that can affect this schedule. Refer to the section below for considerations that can help determine the frequency of watering.

When should I add fertilizer to my Common ice plant?

Common ice plant only requires a small amount of fertilizer during its growing season. It is recommended to fertilize the plant 1-2 times a year, specifically in the spring and autumn. Avoid fertilizing in winter and summer when the plant is dormant. If you have recently repotted the plant, use less fertilizer and wait a few months before applying any.

How can indoor plants like the Common ice plant be supported with artificial lighting?

Indoor plants, including the Common ice plant, require adequate lighting for optimal growth, especially when natural sunlight is insufficient. Artificial lights, such as LED lights, are beneficial as they can be customized to provide specific wavelengths of light needed by plants. For full sun plants, 30-50W/sq ft of artificial light is recommended, 20-30W/sq ft for partial sun plants, and 10-20W/sq ft for full shade plants. The artificial light source should be placed 12-36 inches above the plant, mimicking natural sunlight, and provided for 8-12 hours per day to promote healthier and faster growth.

How should I care for my Common Ice Plant during low temperatures?

Common Ice Plants are not cold-hardy and prefer temperatures above 20°C. It's crucial to keep the plant above 5°C during the winter months to avoid damage. Exposure to temperatures below 1°C can weaken the plant, leading to wilting and increased susceptibility to root rot. For plants with mild frost damage, it's recommended to trim off the frostbitten areas while closely inspecting the roots for rot. If root rot is detected, the affected roots should be removed, and the plant can be propagated through cuttings. To ensure the plant's survival and continued growth during cold periods, move it indoors to a warm location with ample sunlight, ideally near a south-facing window. If natural light is insufficient, consider using supplemental lighting to sustain the plant's health and growth.

What should I think about when watering my Common ice plant?

To properly water your Common ice plant, there are several environmental factors you need to consider. These include the size of the container, the type of soil, temperature, and humidity. Choosing the right container and soil is crucial in determining the frequency and amount of water needed. Make sure the container has good drainage with holes in the bottom to allow excess water to escape. A small container holds less moisture, so it will require more frequent watering, while a larger pot retains moisture longer and needs less watering. Avoid using an oversized pot as it can lead to overwatering. When repotting, choose a container just one size larger than the current one. Since the Common ice plant has shallow root systems, a shallow container works better than a deep one. The water needs of the Common ice plant vary depending on the season. In winter, when growth slows down and energy consumption is low, watering can be less frequent. The cooler air in winter causes less water to evaporate, so the soil remains moist for longer periods. The general climate of your location also plays a role. If you live in a humid area with frequent rainfall, you will need to water less often compared to a dry and arid region. Remember that even within the same location, conditions can differ due to seasonal changes and indoor heating or air conditioning. If you have planted the Common ice plant in the ground, it usually does not require additional watering once the root system is established. It relies on natural precipitation and dew. However, in prolonged dry periods, occasional watering may be necessary. For areas where the plant can only be grown in containers, you can move it outside during the spring and summer months when the temperature is suitable and bring it back indoors as temperatures start to drop. Keep in mind that a potted Common ice plant kept outdoors typically needs more water due to increased sun exposure, even if it is placed on a shaded porch.

When is it a bad idea to put fertilizer on my Common ice plant?

Common ice plant, like other plants, has a dormancy period. During this time, it is important to avoid applying fertilizer. The plant stops growing in the summer and winter, so it is advisable to refrain from fertilizing during these seasons. Additionally, it is recommended to withhold fertilizer for the first few months after repotting in the spring.

What are the symptoms of light deficiency in the Common ice plant?

When the Common ice plant is placed in suboptimal lighting conditions, it may exhibit symptoms of light deficiency. These symptoms include smaller new leaves, leggy or sparse growth, faster leaf drop, slower or no new growth, and lighter-colored new leaves. Chlorosis, sunscald, leaf curling, wilting, and leaf scorching are additional issues that can arise from insufficient or excessive light. These symptoms indicate the plant's struggle with its environment, impacting its ability to photosynthesize and maintain overall health.

What should I do if my Common Ice Plant is exposed to high temperatures?

During the peak of summer, it's essential to ensure the Common Ice Plant is not exposed to temperatures above 38°C, as excessive heat can halt its growth, lead to significant water loss, wilting, and increase the risk of sunburn. If your plant suffers from sunburn or signs of rot, begin by removing the damaged parts. To protect the plant from the harsher afternoon sunlight and aid its recovery, provide some shade until it shows signs of growth again. In cases where root rot has developed due to overwatering in high temperatures, hold off on watering the plant until new, healthy roots have formed. This approach helps in preventing further damage and encourages recovery and growth.

PLATES
Mesembryanthemum crystallinum leaf
PLATE 01 · leaf
Mesembryanthemum crystallinum leaf
PLATE 02 · leaf
Mesembryanthemum crystallinum flower
PLATE 03 · flower
Mesembryanthemum crystallinum flower
PLATE 04 · flower
Mesembryanthemum crystallinum fruit
PLATE 05 · fruit
Mesembryanthemum crystallinum fruit
PLATE 06 · fruit
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