大戟屬多肉質灌木，高可達5m。莖直立多分枝，直徑約5至7cm，肥厚多肉，具3~4稜，表面光滑有白色和灰綠色大理石狀花紋。傷口會分泌白色乳汁。互生橢圓形葉，只短暫存在嫩莖上。稜上有刺；刺成對，長0.2~0.6cm。花黃綠色，園藝栽培時罕見開花。

A Euphorbia succulent shrub, reach up to 5 m in height. Stem is erect and bifurcated, 5 to 7 cm in diameter, thick and fleshy, 3 to 4 ridges, surface smooth with white and gray-green marble-like patterns. It secretes white latex when wounded. Alternate oval leaves are briefly present on the tender stems. Spines are borne in pairs on the ridges, 0.2 - 0.6 cm in length. Yellow-green flowers, cultivars rarely flowering.

栽培：全日照通風環境下可生長良好。高溫生長期可觀察介質乾就澆水，介質須排水良好。可於砂質壤土或培養土中混入粗砂、細石等材料以增加重量來支撐植物。因為莖的質地較軟，露地栽培須注意颱風吹襲，必要時要立支柱支撐。

The plant favors full sun and good ventilation. It requires watering whenever the soil appears dry during warm growing periods. Soil with good drainage, like sandy loam or culture soil is preferred, a mix of materials such as coarse sand and fine stones can add weight to support the plant. When planting in open field, support the plant with stakes to protect soft stems from typhoons if required.

園藝栽培以綴化種與石化種的園藝品種為主。使植株成會扇狀或山峰狀可增加觀賞價值。另有莖變白色的白化品種，更富趣味性。

Cristation and monstrosus are the main cultivars in horticultural cultivation. They would be more ornamental when transformed to shapes of fans or mountains. Albino varieties with incandescent stems have also attracted much attention.