Mesembryanthemum crystallinum, commonly known as the crystalline iceplant or common iceplant, is an extraordinary succulent species known for its shimmering, jewel-like appearance and robust tolerance to poor, salty soils. Native to coastal areas of southern Europe and North Africa, this adaptable and low-maintenance plant has been appreciated both for its ornamental appeal and its unique ecological adaptations. Whether you’re looking to enhance a rock garden, create a striking container arrangement, or restore difficult coastal terrain, M. crystallinum offers dazzling results with minimal effort.

The defining feature of this plant is its surface: the leaves and stems are coated with specialized water-storing cells called epidermal bladder cells, which reflect light and give the plant a crystalline or “iced” appearance. These sparkling bladders aren’t just beautiful—they’re also functional, helping the plant retain moisture and tolerate saline conditions that would challenge most other species.

Growing low to the ground, M. crystallinum forms a spreading mat of succulent foliage that typically reaches 8 to 24 inches across. The leaves are fleshy, green to reddish depending on environmental conditions, and often develop a delicate blush in full sun or nutrient-poor soils. Stems trail along the ground, rooting where they contact soil and rapidly covering exposed areas.

In late spring through early summer, the plant produces small, daisy-like white flowers that open during the day and close at night. Each bloom is about an inch in diameter, with numerous fine petals that contrast elegantly with the glistening leaves. While short-lived, the flowers appear in abundance and are followed by small fruit capsules filled with seeds. Under the right conditions, this species will readily self-seed, establishing a sustainable, recurring presence in the garden or landscape.

One of the most fascinating traits of M. crystallinum is its photosynthetic flexibility. When conditions are mild and moist, it uses typical C3 photosynthesis. However, under stress—such as drought or high salinity—it switches to CAM photosynthesis, opening its stomata at night to minimize water loss. This ability makes it especially well-suited for arid climates, coastal zones, and disturbed soils.

In its native and naturalized environments, Mesembryanthemum crystallinum plays a pioneering role in colonizing bare or damaged soils. It is particularly effective in saline or alkaline sites, helping to stabilize the ground and prevent erosion. In gardening contexts, it’s perfect for sandy borders, xeriscapes, containers, green roofs, and even vertical gardens.

It’s important to note that in some regions (such as parts of California and Australia), M. crystallinum is considered invasive due to its ability to dominate disturbed areas and alter soil chemistry through salt accumulation. Responsible cultivation includes preventing unwanted spread and removing plants before seed dispersal if naturalization is not desired.

Growing from Seed

Mesembryanthemum crystallinum is easy to grow from seed and ideal for gardeners of all experience levels. Seeds germinate in 1–2 weeks when sown on the surface of moist, sandy soil and exposed to light. Do not cover seeds heavily—they require light to germinate. Keep moist until sprouted, then reduce watering as the plants become established. Full sun and good air circulation help maintain compact, healthy growth.

Key Features

Glistening, crystal-like foliage with striking texture
Fast-growing groundcover with moderate spreading habit
Thrives in salty, dry, or poor soils where other plants struggle
Self-seeds easily in mild climates
Great for coastal gardens, containers, and erosion control
Switches photosynthetic modes under stress, making it highly adaptable
Flowers attract pollinators and add a delicate touch to the plant’s bold form

Ideal Conditions

Light: Full sun
Soil: Sandy, well-draining; tolerates saline and alkaline conditions
Watering: Low water needs once established
Temperature: Not frost-hardy; grows as an annual in cold climates
Maintenance: Low; may require containment in sensitive regions

Mesembryanthemum crystallinum seeds offer a unique opportunity to grow one of nature’s most dazzling succulents—both for its shimmering appearance and its exceptional resilience. Whether used ornamentally or functionally, this plant is a brilliant performer in tough environments and a conversation piece in any garden.