Crassula is one of the most fascinating succulent genera in cultivation, loved for the sheer range of forms it offers. Within the genus you find everything from tiny moss-like annuals and dwarf crevice dwellers to neat rosettes, stacked columnar plants, trailing growers and even shrub-sized species such as the well-known jade plant. Southern Africa is the heartland of the genus, with around 149 species recorded there, although Crassula as a genus is far wider-ranging and native on a cosmopolitan scale.

What makes Crassula especially compelling for growers is that it combines beauty with resilience. Many species are adapted to drought through succulent leaves and stems, and the genus is closely associated with CAM photosynthesis, a water-saving strategy in which the stomata open mainly at night rather than in the heat of the day. That is one reason why so many species thrive in water-wise gardens, containers, rockeries and specialist succulent collections.

For collectors, the genus offers endless variety in texture, colour and habit. Some species blush red in stronger light, some stay silver-blue or soft green, some form cushions, some stack into pagoda-like towers, and others disappear into the landscape as miniatures. For gardeners, Crassula is equally valuable because many species are adaptable, compact and rewarding from seed, making them ideal for both South African growers and international hobbyists looking to build a diverse succulent collection.

Crassula undulata (Crassula dejecta, Crassula albiflora, Crassula albiflora minor, Crassula obvallata) – Fringe Stonecrop, Doily Stonecrop, Doily Crassula

Crassula undulata is a striking South African endemic that brings bold structure and real collector appeal to any succulent offering. Naturally distributed from Namaqualand to the Agulhas Plain in the Northern and Western Cape, it occurs in the Fynbos and Succulent Karoo, where it typically grows on large rock outcrops, tucked into crevices and ledges, often on cooler south- or southwest-facing mountain slopes. That wild origin gives this species an unmistakable sense of place and makes it especially desirable for South African growers wanting indigenous beauty, as well as international collectors searching for distinctive Cape succulents with true habitat character.

This is a densely branched succulent shrublet, often reaching up to about 40 cm tall, with slightly woody stems and beautifully ordered leaves stacked in neat opposite rows along the branches. The foliage is green to yellow-green and frequently flushed with red, especially where the light is strong, creating the warm green, amber and reddish tones that make mature plants so eye-catching. Each leaf is small, fleshy and neatly shaped, with tiny rounded marginal hairs that can give the edges a silvery, beaded effect, adding another layer of fine detail for close-up appreciation.

When in bloom, Crassula undulata becomes even more memorable, carrying dense, flat- to rounded flower heads at the tips of the stems. The flowers are white, often softly tinged pink or red, with reddish floral details that deepen the contrast against the colourful foliage. In habitat, flowering is recorded mainly from November to February, sometimes beginning in October, which places its showiest season in the South African spring-to-summer period. The overall effect is architectural yet delicate, making this an excellent species for collectors who appreciate both form and flower.

For seed buyers, Crassula undulata offers the chance to grow a species that looks both refined and dramatic, with strong lines, stacked leaves and elegant flowering heads that stand out in any specialist collection. It suits succulent enthusiasts, rare-plant collectors, gardeners and hobbyists alike, whether you are growing in South Africa or building a world-class collection abroad. Check out our online seed store, explore our Massive Range and Buy Now from Seeds and All. We offer combined South African and International shipping, making it easy to add exceptional Crassula species like this one to your collection.