Euphorbia caerulescens Haw.
Blue Euphorbia, Blue Noors, Sweet Noors, Sweet Noor Succulent
Euphorbia coerulescens, Euphorbia ledienii, Euphorbia ledienii var. dregei, Euphorbia ledienii var. ledienii
This species is native to South Africa. It grows on stony slopes and flats among arid scrub and larger bushes from Calitzdorp to Klipplaat and Jansenville.
Euphorbia caerulescens, also known as Euphorbia coerulescens, is a succulent shrub with numerous erect stems with edges covered with paired stiff spines and tiny, short-lived leaves. It grows up to 5 feet (1.5 m) and spreads by rhizomes. A mature plant covers an area of more than 3.3 feet (1 m) in diameter. Stems are 4- to 6-angled, up to 2 inches (5 cm) in diameter, and constricted at intervals. They are usually blue-grey, but also green or yellowish-green. The lower part of the stems becomes pale grey and rough with age. Spines are 0.5 inches (1.2 cm) long and vary from white to dark brown. The yellow cyathia are bisexual, about 0.2 inches (0.5 cm) in diameter, and appear at the tip of the stems in spring and summer. Fruits are pink 3-locular capsules.
The specific epithet "caerulescens (see-roo-LES-enz)" is a Latin adjective meaning "darkish green, blue" or "cerulean" and refers to the color of the stems.
How to Grow and Care for Euphorbia caerulescens
Light: This succulent is a sun lover. Place your indoor E. caerulescens 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. caerulescens requires well-drained soil. Use a commercial mixture formulated for succulents, or make your own potting mix.
Temperature: High summer temperatures are not a problem, but low winter temperatures can damage or kill your plant. E. caerulescens can withstand temperatures as low as 30 °F (-1.1 °C). USDA Plant Hardiness Zones 10a to 11b, 30 to 50 °F (-1.1 to 10 °C).
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. caerulescens 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. caerulescens 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 caerulescens
E. caerulescens 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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