African blue basil (Ocimum kilimandscharicum × basilicum 'Dark Opal') is one of a few types of basil that are perennial. It is a sterile hybrid of two other breeds of basil, unable to produce seeds of its own, and is propagated by cuttings. This particular breed of basil has a strong camphor scent, inherited from Ocimum kilimandscharicum (camphor basil), its East African parent. The concentration of camphor is 22% (compared with 61% for O. kilimandscharicum). The concentration of the other major aroma compounds, linalool (55%), and 1,8-cineole (15%) is comparable to many basil cultivars.