Not one of the usual suspects for this time of year, but though lots of people praise this lovely euphorbia, not many talk about how gorgeous it is in winter.
The purplish-blue glaucous leaves, with an accent of red at the centre of each rosette, hold their form and colour so well. They make a compact mound in the border which looks even more beautiful when, as in this picture, a drop of water or frost is held motionless and perfect on the surface of a leaf. This is a beautiful plant to use as an unusual evergreen accent: about two feet high, rising to about three feet in summer with the flowers (equally stunning) come out. I wouldn't be without it.