Euphorbia phosphorea makes a highly interesting house plant here in the UK. It originates from Brazil where it naturally inhabits exposed rocky hills and gravelly plains. The shrub forms a small tree and its short trunk divides above the ground into several, strongly ribbed branches. These form a crown and it can reach up to 6 metres in the wild, although the more normal height is around 2m. The name of this plant relates to a peculiar phosphorescent light that it can emit at night. This is thought to occur within the milky sap and might be caused by parasitic fungus. It is unlikely to develop this in the UK, where the fungi are not present.