Euphorbia phosphorea, also known as the "Glowing Spurge," is a unique and interesting succulent plant that belongs to the Euphorbiaceae family. It is native to South Africa, particularly in the regions of the Western Cape and Eastern Cape.

Appearance: Euphorbia phosphorea is a small-sized succulent that grows in a rosette shape with tightly packed, cylindrical, and finger-like stems that resemble a coral reef. The stems are bright green in color and have a smooth, waxy texture. The plant has no leaves, and the stems are the main source of photosynthesis. Euphorbia phosphorea gets its name from the phosphorescent or glowing appearance of its stems, which can emit a greenish glow in certain lighting conditions, especially in low light or under UV light.

Care requirements: Euphorbia phosphorea is a relatively low-maintenance plant, but it does require specific care to thrive.

1. Light: Euphorbia phosphorea prefers bright, indirect sunlight. It can tolerate partial shade but may lose its characteristic phosphorescent glow in low light conditions. Avoid placing it in direct sunlight for prolonged periods as it can cause sunburn on the stems.

2. Temperature: Euphorbia phosphorea prefers warm temperatures and can tolerate a minimum temperature of 50°F (10°C). Protect it from frost as it is not frost-tolerant.

3. Watering: Euphorbia phosphorea is a drought-tolerant plant and should be watered sparingly. Allow the soil to dry out between watering sessions to prevent over-watering, which can cause root rot. Water it more sparingly during the winter months when it goes into a period of dormancy.

4. Soil: Euphorbia phosphorea prefers well-draining soil, such as a succulent or cactus mix. Avoid using heavy or water-retentive soils, as they can cause root rot.

5. Fertilizer: Euphorbia phosphorea does not require frequent fertilization. You can fertilize it with a balanced, water-soluble fertilizer diluted to half strength during the growing season (spring and summer) every 2-4 weeks.

6. Potting: Euphorbia phosphorea is best grown in a shallow pot or container with good drainage to prevent waterlogging.

7. Toxicity: Euphorbia phosphorea, like many other Euphorbia species, contains a milky sap that is toxic and can cause skin irritation, eye irritation, and digestive discomfort if ingested. Take care when handling the plant and keep it away from children and pets.

Propagation: Euphorbia phosphorea can be propagated from stem cuttings. Allow the cuttings to dry out for a few days before planting them in well-draining soil. It's essential to wear gloves and take caution while handling the plant to avoid contact with the toxic sap.

Pests and diseases: Euphorbia phosphorea is generally resistant to pests and diseases. However, it can be susceptible to mealybugs, scale insects, and fungal diseases if it is kept in overly humid conditions or over-watered. Regularly inspect the plant for signs of pests or diseases, and treat them promptly with appropriate measures.

In conclusion, Euphorbia phosphorea is a fascinating succulent plant with its unique glowing appearance and relatively low-maintenance care requirements. With proper care, it can make an excellent addition to a succulent collection or as an interesting focal point in any indoor or outdoor garden.

Did you know?
The botanical name Euphorbia is derived from Euphorbos, the Greek physician from the 1st century AD. In 1753, the botanist and taxonomist Carl Linnaeus gave the entire genus the name Euphorbia in honour of this doctor.

And yes, that's right, euphorbias are not cacti, even though many of them look pretty much like a cactus.