Green Jade Tree (Euphorbia tirucali L.), also known as: light stick tree, green coral, green coral, iron tree, iron Luo, keel tree, fairy stick, keel tree, milk onion tree, termite tree, etc., is a plant of the genus Dazai in the family Dazai. Native to the Mediterranean coastal areas of Africa, now distributed in Hong Kong, Taiwan Penghu Islands, Hainan, the United States, Malaysia, India, Britain and France. Flowering June-September, fruiting July-November. Due to the dry environment of the origin, the leaves fall off earlier to reduce water evaporation, so it is often leafless, and its appearance looks like green jade, so it gets this name. The green jade tree is a petroleum plant, a medicinal plant, and an ornamental. It is also a medicinal plant and has ornamental properties. Because it is drought-resistant, salt-resistant and wind-resistant, it is often used as a windbreak forest or landscaping tree on the seashore.

Because the green jade tree has the characteristics of drought-resistant, salt-resistant, wind-resistant and can grow in poor soil, people often plant it in areas with little rain. Greening afforestation and soil protection. The milky sap of the green jade tree is rich in hydrocarbons and is similar to the composition of petroleum. Some studies have pointed out that 100kg of green jade tree stems can extract 8kg of petroleum substances. It can be directly or mixed with other substances into crude oil, as fuel oil to replace oil.