Bituminaria — 1 species

Cultivation

Bituminaria bituminosa is native to the Mediterranean region and warm temperate areas of southern Europe, where it can grow at elevations from sea level to more than 2,000 metres. Forms from the Canaries (often known as var albomarginata) are the least cold-hardy, the leaves being killed by mild frosts of short duration - though it will often regrow, Forms from higher elevations in the Mediterranean are known to tolerate temperatures falling to -10°c or even lower. Mean annual rainfall can be as low as 150mm in Macaronesia, whilst at higher elevaions in the Mediterranean it can exceed 1,000mm.