Coltsfoot is both an important medicinal plant and a weed of loamy and clay soils, found growing in ditches alongside field paths and in freshly dug excavations.

Dead-nettle or Urtica mortua (the name by which it was often known in mediaeval Latin) is a hardy plant. The temperature only has to rise slightly above freezing and it comes to life. It is one of the overwintering weeds of field and fallow land, though it also grows in large numbers in gardens, waste places, and along field paths.

As far as colour is concerned, the general colour scheme of the house will have a great bearing on the choice of material; rather dull coloured rooms, for instance, are an ideal setting for the scarlet hued varieties and the brilliant yellow and orange shades, while pink and salmon shades look exceptionally well in the light modern rooms in which the decorations are of a neutral tone or consist of pale greens and fawns and so on.