Cereus repandus f. monstruosus
Accepted Scientific Name
Cereus repandus (L.) Mill.
Curiosity Plant, Monstrose Apple Cactus
Cactus abnormis, Cactus peruvianus f. monstrosus, Cactus peruvianus f. monstruosus, Piptanthocereus peruvianus var. monstrosus, Piptanthocereus peruvianus var. monstruosus, Cereus peruvianus f. monstrosus, Cereus peruvianus f. monstruosus, Cereus repandus f. monstrosus
Cereus repandus f. monstruosus, also known as Cereus peruvianus f. monstruosus, is a large shrubby or tree-like cactus with many upright, branched, and irregularly ribbed stems that give it a fascinating sculptural quality. This unusual cactus grows up to 15 feet (4.6 m) tall, usually much-branched from the base. Stems are gray-green to blue-green, spinless, or with gray, up to 2 inches (5 cm) long spines. Flowers are fragrant, white with reddish tips, and appear at night in early summer. Edible fruits are spherical to egg-shaped, usually red, but also yellow to deep violet-red.
The formal epithet "monstruosus (mon-stru-OH-sus)," also spelled "monstrosus," is a Latin adjective meaning "strange, preternatural, or monstrous."
How to Grow and Care for Cereus repandus f. monstruosus
Light: This cactus likes full sun. It can handle partial shade but thrives in direct sunlight during the summer. A sunny window is a good spot to grow C. repandus f. monstruosus indoors. Rotate the pot a quarter turn every week or two to encourage balanced growth. If possible, get your cactus outdoors from spring to fall.
Soil: C. repandus f. monstruosus 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: During the active growth period, this cactus likes warm temperatures, while in winter, it likes cooler temperatures. C. repandus f. monstruosus can withstand temperatures as low as 20 to 50 °F (-6.7 to 10 °C), USDA hardiness zones 9a to 11b.
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. Then, during the winter, when C. repandus f. monstruosus 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. Instead of making a solution of water and fertilizer, there are also dry fertilizers. Do not fertilize during the winter.
Repotting: While C. repandus f. monstruosus is young, it is recommended to repot each year in early spring. Then, once it matures, repot when your cactus is outgrowing its pot.
Propagation: Using stem cuttings is the easiest method to propagate C. repandus f. monstruosus because seed propagation is a slow process. Planting of the cuttings is best done when the cactus is actively growing. Spring and summer is the best time to sow the seeds.
Learn more at How to Grow and Care for Cereus.
Toxicity of Cereus repandus f. monstruosus
C. repandus f. monstruosus is non-toxic to humans or animals.
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