Euphorbia cryptospinosa P.R.O.Bally
Euphorbia cryptospinosa is a sparsely branched, erect or subscandent succulent shrub with a small tuberous root and narrow branches arising in whorls. It grows up to 10 feet (3 m) tall. Branches are fleshy, cylindrical, with 5 to 10 longitudinal ribs, and up to 0.4 inches (1 cm) in diameter. Spine shields are joined to form horny reddish-grey strips along the ribs, almost completely covering the branches, separated only by green, very narrow grooves. Spines are very fine and soft, occur in pairs, and are evident only in young growth. Leaves are linear, soon deciduous, and about 0.1 inches (0.25 cm) long. Cyathia are bright crimson and 0.15 inches (0.4 cm) in diameter. Fruits are 3-lobed capsules.
E. cryptospinosa is remarkably similar to Peniocereus striatus, a cactus endemic to the Sonoran Desert.
The specific epithet "cryptospinosa (krip-toh-spin-OH-suh)" means "with hidden spines." It is a compound of two words, the prefix "crypto-," meaning "hidden" and feminine form of the Latin adjective "spinosus," meaning "thorny, prickly," and refers to the cryptic spines of the species.
How to Grow and Care for Euphorbia cryptospinosa
Light: This succulent is a sun lover. Place your indoor E. cryptospinosa in a sunny window. From spring to fall, you may place the pot on the balcony or in the garden. Increase sun exposure gradually to prevent sunburn.
Soil: E. cryptospinosa requires well-drained soil. Use a commercial mixture formulated for succulents, or make your own potting mix.
Hardiness: High summer temperatures are not a problem, but low winter temperatures can damage or kill your plant. E. cryptospinosa can withstand temperatures as low as 30 to 50 °F (-1.1 to 10 °C), USDA hardiness zones 10a to 11b.
Watering: From spring to fall, water when the top inch (2.5 cm) of soil feels dry. Reduce watering in winter. Give it just enough water to prevent wilting. The best time of the day to water your E. cryptospinosa in the warm season is the evening.
Fertilizing: Plants in a pot need regular feeding. Apply a balanced fertilizer in a 10-10-10 NPK formulation, diluted to 1/4 strength once a week during the growing season.
Repotting: E. cryptospinosa will benefit from repotting, but it does not need to be repotted every year. When your plant is outgrowing its pot, it is time to repot it in a larger pot and give it a fresh potting mix. The repotting is best done in early spring, at the beginning of the growing season. Wear gloves, protective clothing, and appropriate eye protection when repotting this succulent.
Propagation: The easiest and fastest method of propagation for this plant is by using cuttings. It can also be grown from seeds, but it can be difficult to germinate. The best time to take cuttings is in spring or summer. Sow the seeds in spring.
Learn more at How to Grow and Care for Euphorbia.
Toxicity of Euphorbia cryptospinosa
E. cryptospinosa produces a white milky sap that is toxic and can cause irritation to the skin and eyes. Therefore, it is best to keep your plant away from children and pets.
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