Euphorbia tubiglans aka Tubiglans Spurge

Euphorbia tubiglans is an easy-going succulent that thrives with minimal effort once established. It tolerates neglect well and requires very little maintenance beyond infrequent watering and adequate sunlight. This makes it a good choice for beginners to succulent growing, though developing an impressive exposed caudex takes patience and experience.

Euphorbia tubiglans is a slow-growing, long-lived dwarf succulent. The underground caudex reaches up to 8.5 cm tall and 4.5 cm in diameter, while the aerial branches grow to about 8 cm tall and 1.5–2 cm wide, though they can grow somewhat taller in cultivation. The plant typically forms a compact clump of 2 to 5 columnar branches with a spread of around 10 cm.

Euphorbia tubiglans prefers warm temperatures between 18–30°C (65–85°F) during the growing season. It can tolerate brief exposure down to −5°C (23°F), but keeping it above 8°C (46°F) in winter is strongly recommended. Protect from frost and prolonged cold combined with wet soil, which can cause fatal root rot.

Euphorbia tubiglans produces small cyathia (the specialized flower structures unique to Euphorbia) near the branch tips during spring and summer. The flowers feature distinctive red tubular nectar glands that contrast attractively with white involucre lobes. Because this species is dioecious — having separate male and female plants — you need both sexes to produce viable seed.

Euphorbia tubiglans can be propagated by seed or stem cuttings. For cuttings, take offsets in spring, allow the cut surface to dry and callus for at least 7 days, then plant in a sand and pumice mix at around 20°C. Use rooting hormone for best results. Seed-grown plants are preferred if you want the plant to develop an impressive caudex, as cutting-grown plants do not form caudices as readily. Always wear gloves when taking cuttings — the milky latex sap is a skin irritant.

Repot Euphorbia tubiglans every 2–3 years during spring when the plant is actively growing. Choose a pot only 1–2 sizes larger than the current one, as the plant prefers being slightly root-bound. Use a relatively deep pot to accommodate the long taproot and caudex. Refresh with well-draining mineral soil mixed with pumice or perlite to ensure continued healthy root development.

Euphorbia tubiglans is susceptible to mealybugs, scale insects, and occasionally spider mites. Root rot from overwatering is the most common cause of plant death — always ensure excellent drainage and avoid waterlogged soil, especially during winter dormancy. Inspect regularly for cottony mealybug clusters between the ribs and treat promptly with isopropyl alcohol or insecticidal soap.

Euphorbia tubiglans can grow outdoors year-round in USDA zones 10–11, where temperatures reliably stay above freezing. Plant in a well-drained, sunny spot protected from excessive rainfall. In cooler climates, grow it in a pot outdoors during summer and bring it inside before temperatures drop below 8°C (46°F). It does well in rock gardens, raised beds, and succulent collections in Mediterranean or arid climates.

Euphorbia tubiglans is naturally a very slow-growing species, so gradual development is completely normal and not a cause for concern. If growth has stalled entirely, check for root rot from overwatering, insufficient light, or exhausted soil. Ensure the plant gets bright direct sunlight, water sparingly, and repot with fresh mineral soil every 2–3 years. Growth slows further during winter dormancy, which is expected.

Tubiglans Spurge’s native range is Worldwide.

Tubiglans Spurge does best in dry soil and should only be watered sparingly.

To ensure the health of your Tubiglans Spurge, it's crucial to use a potting soil that won't hold too much moisture. A soil that drains well and contains perlite or vermiculite for drainage and organic matter for nutrition is ideal. Adding a few handfuls of perlite to store-bought cactus soil is an easy way to create this type of soil mix.

Tubiglans Spurge thrives in bright and direct sunlight. To ensure your plant receives enough light to survive, place it less than one foot from a window. The current weather in your area may affect the placement in your home. For example, if you live in a region that has longer and more intense periods of sunlight, then you may want to place the plant farther away from the window to avoid direct sunlight and reduce the risk of sunburn. Alternatively, if you live in a region with relatively milder temperatures and less intense sunlight, then you may be able to place the plant closer to the window for increased exposure. Ultimately, the current weather in your area should be taken into consideration when determining the best placement for your Tubiglans Spurge.

Tubiglans Spurge prefers dry environments, so misting the plant to provide extra humidity and allow water to linger on the leaves can create an ideal environment for fungi that can be harmful.

The growth rate of Tubiglans Spurge is slow and it doesn't necessitate additional fertilizing. By changing the soil in its pot annually, the plant should be provided with adequate nutrition. It is crucial to keep in mind that plants derive their energy from the sun, not fertilizers.

The toxicity level of this plant has not been officially confirmed by Ploi. If there is a possibility of ingestion of plant material with an uncertain toxicity by you, a family member, or a pet, it is advisable to seek the assistance of a medical professional.

During the wintertime, it's common for Tubiglans Spurge to go dormant and their growth may slow down, so waterings should be spaced out more.