Echinocereus rigidissimus subsp. rubispinus 'Albiflorus'
Accepted Scientific Name
Echinocereus rigidissimus subsp. rubispinus
Echinocereus rigidissimus subsp. rubispinus f. albiflorus, Echinocereus rigidissimus var. albiflorus, Echinocereus rigidissimus subsp. rubispinus 'Karl Werner Beisel'
Echinocereus rigidissimus subsp. rubispinus 'Albiflorus' is a beautiful small cactus with an erect, cylindrical stem nearly hidden by the closely set cream-colored to pinkish-yellow spines. The stem has 15 to 26 ribs and grows up to 10 inches (25 cm) tall and 2.8 inches (7 cm) in diameter, solitary at first, then producing offsets to form a small clump with age. Each areole bears 30 to 35 pectinately arranged radial spines that lie flat against the stem. The central spines are absent.
The beautiful white flowers are funnel-shaped, up to 3.2 inches (8 cm) long and 3.6 inches (9 cm) in diameter, and appear near the top of the stem in late spring and summer. Fruits are spiny, greenish or purple-brown, with white pulp and tiny black seeds. They are spherical and up to 1.2 inches (3 cm) in diameter.
This cultivar is usually sold as Echinocereus rigidissimus var. albiflorus. In Europe, it is also sold as Echinocereus rigidissimus subsp. rubispinus 'Karl Werner Beisel'.
The cultivar epithet "albiflorus (al-BIH-flor-us)" means "white-flowered" and refers to the color of the flowers.
How to Grow and Care for Echinocereus rigidissimus subsp. rubispinus 'Albiflorus'
Light: This cactus needs bright light to perform its best. It can handle partial shade but thrives in full sun during the summer. A sunny window is a good spot to grow E. rigidissimus subsp. rubispinus 'Albiflorus' indoors. Rotate the container a quarter turn every week or two to encourage balanced growth. If possible, get it outdoors from spring to fall.
Soil: Good drainage is essential for a healthy plant. E. rigidissimus subsp. rubispinus 'Albiflorus' does not like to have "wet feet" and needs to be grown in well-draining soil. Use commercial soil mixes for cacti or make your own mix.
Hardiness: From spring to fall, during its growing season, this cactus likes warm temperatures, while in winter, it likes cooler temperatures. E. rigidissimus subsp. rubispinus 'Albiflorus' can withstand temperatures as low as 20 (-6.7 °C). USDA Plant Hardiness Zones 9a to 11b, 20 to 50 °F (-6.7 to 10 °C).
Watering: From spring to fall, water thoroughly, but allow the soil to dry out before watering again. With the arrival of fall, gradually reduce the watering frequency. In winter, when this cactus is dormant, give it just enough water to prevent shrinking.
Fertilizing: During its growing season, this cactus likes regular fertilizing. A balanced, water-soluble fertilizer, diluted to 1/4 strength, can be added to the water for each watering. A 10-10-10 fertilizer is ideal. Do not fertilize during the winter.
Repotting: While E. rigidissimus subsp. rubispinus 'Albiflorus' is young, repot each year in early spring. Once it matures, repot when it is outgrowing its container.
Propagation: This cactus is easy to propagate by offsets. The best time to remove offsets is in spring and summer.
Learn more at How to Grow and Care for Echinocereus.
Toxicity of Echinocereus rigidissimus subsp. rubispinus 'Albiflorus'
E. rigidissimus subsp. rubispinus 'Albiflorus' is non-toxic to humans or animals.
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