Brent Hine (2018 edit – a former curator of the E.H. Lohbrunner Alpine Garden) only recently planted this spurge in 2005, so I’ve yet to see and smell its flowers. I’m particularly anticipating the fragrance. If you’re familiar with the common name for another organism, Apis mellifera, you can likely guess that the flowers are honey-scented. This photograph shows the other reason it is popular in gardens – its foliage. Indeed, garden designer Mary Newstead gives it high praise: “arguably the finest member of the Euphorbia family” (2018 edit – the page this used to link to has disappeared).
Often cited as being native to the Canary Islands (which it is), honey spurge can also be found in the Madeira Islands. In Maderia Islands’ Laurasilva, it grows as an understory shrub or small tree. In colder temperate climes, though, it grows as a small shrub or shrubby perennial.
Botany / science resource link: Electronic Sites of Leading Botany, Plant Biology and Science Journals links to the web sites of nearly one thousand scientific journals. A quick browse of the list reveals the depth and breadth of botany sensu lato (in the broad sense).