Euphorbia tubiglans Marloth ex R.A.Dyer
Euphorbia tubiglans is native to South Africa. It occurs in the Eastern Cape and Western Cape in open karroid shrubland, stony slopes, flats, loose sandy soils under small shrubs, or wedged among stones.
Euphorbia tubiglans is a dwarf succulent with a thick, fleshy rootstock from which arise 2 to 5 upright, unbranched, glaucous branches with 5 to 6 ribs lined with small tubercles. The caudex can reach up to 3.4 inches (8.5 cm) in height and 1.8 inches (4.5 cm) in diameter. The branches can grow up to 3.2 inches (8 cm) long, often longer in cultivation, and 0.9 inches (2.2 cm) in diameter.
The flowers are unisexual, with male and female cyathia on separate plants, green more or less tinged with yellow or red, and appear near the apex of the branches in spring and summer. The nectar-bearing glands are red, contrasting with the white involucres, and form a tube, hence the specific epithet.
USDA hardiness zones 10a to 11b: from 30 °F (−1.1 °C) to 50 °F (+10 °C).
How to Grow and Care
Euphorbias are very easy to care for. These plants require a little pampering to become established, but once they are, they are self-sufficient. More die from too much care and watering than from neglect. Euphorbias need well-draining soil and lots of sunlight. They are not particular about soil pH but cannot tolerate wet soil. Unlike most succulents, Euphorbia does not handle long periods of drought well. It may need weekly watering during the summer. Water whenever the soil is dry several inches below the surface. Water deeply, but don't let them sit in wet soil, which can cause root rot. Add some organic matter or fertilizer to the planting hole. If you are growing them in containers or your soil is poor, feed them with a half-strength fertilizer monthly.
These succulents can be grown from seed, but they can be difficult to germinate (or even find). They are usually propagated by cuttings. This can be tricky because of the exuding sap. Rooting hormone is recommended with Euphorbias. They tend to grow problem-free, but there are a few pests and diseases to be alert for.
Learn more at How to Grow and Care for Euphorbia.
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