Euphorbia grandidens Haw.
Big-Tooth Euphorbia, Large-toothed Euphorbia, Largetooth Euphorbia, Lowveld Euphorbia, Lowveld Naboom, Tree Euphorbia, Valleybush Euphorbia, Valleybush Naboom, Valley Naboom
Euphorbia arborescens, Euphorbia evansii, Euphorbia magnidens
Euphorbia grandidens is a spiny succulent tree with one or several cylindrical trunks and ascending branches that bear an apical whorl of green, 2- to 4-angled, deciduous branchlets. It grows up to 52.5 feet (16 m) tall. Branchlets are up to 0.8 inches (2 cm) wide with large teeth and short but very sharp spines along the angles. Tiny leaves are scale-like and deciduous. Flowers are pale yellow and appear along the angles of the branchlets in spring. Fruits are 3-lobed capsules, mauve to red-brown and 0.6 inches (1.5 cm) in diameter.
The specific epithet "grandidens (GRAN-di-denz)" means "large-toothed" and refers to the teeth along the angles of the branches. It is a compound of two Latin words, the adjective "grandis," meaning "large" or "great," and the noun "dens," meaning "tooth."
How to Grow and Care for Euphorbia grandidens
Light: This succulent is a sun lover. Place your indoor E. grandidens 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. grandidens 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. grandidens can withstand temperatures as low as 25 to 50 °F (-3.9 to 10 °C), USDA hardiness zones 9b 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. grandidens 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. grandidens 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 grandidens
E. grandidens produces a white milky sap that is toxic and can cause irritation to the skin and eyes. It is best to keep your plant away from children and pets.
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