Piaranthus cornutus

Scientific Name

Piaranthus cornutus N.E.Br.

Synonym(s)

Ceropegia cornuta, Piaranthus cornutus var. cornutus, Piaranthus decorus subsp. cornutus

Scientific Classification

Family: Apocynaceae
Subfamily: Asclepiadoideae
Tribe: Ceropegieae
Subtribe: Stapeliinae
Genus: Piaranthus

Description

Piaranthus cornutus is a small succulent with obtusely 4-angled, greyish- or glaucous-green stems with 3 to 5 tubercle-like teeth along the angles. The stems are erect to ascending, spherical or oblong, up to 2 inches (5 cm) long, in cultivation often longer, and up to 0.7 inches (1.8 cm) in diameter.

Flowers are erect and appear in pairs on up to 0.7 inches (1.8 cm) long pedicels above the middle or at the tips of the stems in late summer and fall. The corolla is deeply lobed, without a distinct tube, and up to 1.1 inches (2.8 cm) in diameter. Lobes are lance-shaped, smooth on the back, velvety on the inner face, yellowish or whitish, and dotted with purple or crimson. The yellow columnar corona forms the flower center. Fruits are up to 4 inches (10 cm) long follicles with quite large seeds.

Origin

The native range of this species is from southern Namibia to Northern Cape, Western Cape, Eastern Cape, and Free State in South Africa.

Etymology

The specific epithet "cornutus (kor-NOO-tus) means "horned, having horns" and refers to the corolla lobes.

How to Grow and Care for Piaranthus cornutus

Light: P. cornutus grows best in full sun or partial shade. It will benefit from light shade during the hottest summer days. Indoors, place the plant near the brightest window in your home. Avoid abruptly moving plants adapted to lower light levels to full sun to prevent sunburn.

Soil: Use commercial potting soil mix for succulents or prepare your own with 50 to 70 % mineral grit, such as coarse sand, pumice, or perlite.

Temperature: This plant thrives in warm outdoor environments with low to moderate humidity. It does not like winter cold and should remain fairly dry and warm during its winter dormancy. P. cornutus can withstand temperatures as low as 35 °F (1.7 °C). USDA Plant Hardiness Zones 10b to 11b, 35 to 50 °F (1.7 to 10 °C).

Watering: P. cornutus has typical watering needs for a succulent. During the growing season, from spring to fall, water your plant thoroughly and allow the soil to dry between waterings. Do not water in winter. The plant goes dormant in winter and needs almost no water, about once a month.

Fertilizing: If you want to keep your plant healthy and thriving, fertilization is a good idea. Feed with water-soluble fertilizer diluted to half the recommended strength only when the plant is actively growing.

Repotting: Repot your plant in spring just before the growing season. P. cornutus has shallow roots and does not require too much soil to grow. Pick a container with drainage holes.

Propagation: The best way to propagate this succulent is from stem cuttings. Take cuttings during the growing season to ensure good rooting. P. cornutus is also easy to grow from seeds. Sow the seeds in spring.

Learn more at How to Grow and Care for Stapeliads.

Toxicity of Piaranthus cornutus

P. cornutus has no toxic effects reported. It is safe around pets and humans.