If you love vygies and waterwise gardening, Delosperma is one of those genera that quickly becomes addictive. These are mostly low, mat-forming succulents in the Aizoaceae, famous for their shimmering “ice” cells on the leaves and stems that catch the light like tiny crystals – a clever way of reflecting harsh African sun while storing precious moisture.

The genus is centred in southern Africa, with the bulk of species in South Africa and Lesotho, but stretching north into eastern Africa as far as Ethiopia and even into the Arabian Peninsula. Many are local endemics tied to specific rock types or mountain systems – from arid Karoo flats and grassland dolerite outcrops to subalpine Drakensberg cliffs. Seed capsules are typically hygrochastic: they open when wet, using little “valves” and wings to present or flick out the seed in rain – exactly the kind of detail that makes them fascinating subjects for a seed-focused collector.

In the garden, Delosperma species are valued for their carpets of daisy-like flowers in intense shades of magenta, pink, purple, yellow and orange, often over a very long season. Given full sun and sharply drained, sandy or gravelly soils, many species are remarkably drought tolerant and need little more than occasional watering once established. They are ideal for rockeries, retaining walls, containers, green roofs and banks where a tough, colourful, pollinator-friendly groundcover is needed.

For a succulent enthusiast in South Africa, Delosperma offers a huge palette of local biodiversity – from tiny, niche endemics to showy garden workhorses – all fitting neatly into the broader push toward waterwise, climate-resilient gardening.

Delosperma mariae

Delosperma mariae is a limestone-loving Western Cape endemic with a very restricted range on the Agulhas Plain, where it occupies limestone flats and outcrops in fynbos and strandveld communities.

It is assessed as Vulnerable on the Red List, with threats including coastal development, invasive alien plants and fire mismanagement, so ex situ cultivation plays a small supporting role in its long-term conservation.

Plants are sprawling or prostrate and somewhat similar in habit to Delosperma guthriei, but with shorter, minutely papillate leaves (to about 15 mm), forming neat, low mats over the limestone stones and gravel. The flowers are relatively small, about 10 mm in diameter, with purplish to purplish-rose petals that open fully in bright light. SANBI notes that flowering peaks in midsummer, from January to February, on the Agulhas Peninsula.

In South African gardens, Delosperma mariae is best suited to collectors and enthusiasts recreating Cape limestone or coastal fynbos communities. It will do best in full sun, in a gritty, alkaline medium with plenty of limestone or dolomite chips, and excellent drainage. For coastal Western Cape gardeners it can be grown outdoors year-round; inland, providing a well-drained rock garden or trough in a sunny, sheltered position will give it the conditions it needs to thrive.