Huernia thuretii var. primulina (N.E.Br.) L.C.Leach
Huernia thuretii var. primulina, formerly known as Heurnia primulina, is a leafless succulent that forms dense clumps up to 12 inches (30 cm) in diameter. The stems are green, acutely 4– to 5-angled, up to 1 inch (2.5 cm) thick, excluding the teeth. The ribs are with compressed deltoid teeth up to 0.2 inches (5 mm) long, with dark-colored, very acute recurving tips. Pale yellow flowers, 3 to 8 from the basal part of the stems, are about 2.5 cm across, with a deep bell-shaped center.
USDA hardiness zones 10a to 11b: from 30 °F (-1.1 °C) to 50 °F (+10 °C).
Huernias require a potting mix with excellent drainage. A succulent plant mix of 50 percent pumice or perlite, 25 percent peat or organic mulch, and 25 percent sand helps prevent rotting and overwatering. Roots experience dieback in cool-season dormancy, so plants grow best in shallow containers that allow the soil to dry out quickly. Using clay pots further helps the soil from staying too wet. An underlayment of coarse gravel below the soil mix also improves drainage. In climates with damp, cool summers, a layer of gravel between the plant and the soil mix also helps prevent the stems from staying too moist.
Outdoor plantings do well in raised beds. Huernias prefer bright light or partial shade. In nature, they grow underneath shrubs or other plants. Too much sun causes stems to develop protective reddish or purple pigmentation and can actually scald the stems. Too little light leads to weak, thin growth with decreased flower production. These plants grow best between 50 and 80 °F (10 and 27 °C). Protect them from freezing weather.
Learn more at How to Grow and Care for Huernia.
Native to South Africa.
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