A brilliant species producing 3in long tubular vivid red flowers from early spring until well into summer. The foliage is not evergreen (contrary to the specific epithet) but is a rich soft purple when it first emerges, and the top-most pair form a dish around the flowers. Fully hardy and easy in a sunny spot on a wide variety of soils. Much better than x brownii, which for some reason is usually recommended over sempervirens.
Grow it in a Pyracantha and make an ersatz Embothrium!
1L pots ~ £12