African blue basil (Ocimum kilimandscharicum × basilicum 'Dark Opal') is native to Kenya, Tanzania, Uganda, Sudan, and Ethiopia.It is one of a few types of basil that is perennial. It is a sterile hybrid of two other breeds of basil, unable to produce seeds of its own, and is propagated by cuttings.Ocimum kilimandscharicum 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.