Radium Weed plant, Euphorbia peplus, is also known as Petty Spurge, Milkweed and Cancer Weed The corrosive properties of the sap of Radium Weed have been know to herbalists since Galen in the second century. A well known cure for warts, corns, callouses and sun-cancers. Radium Weed plant is native to Eurasia and the Mediterranean and prefers humus rich, moist soils in a protected, sunny position. Drought and frost tender. An annual plant, growing to 0.3m x 0.25m. Readily volunteers.