Red rubin basil (Ocimum basilicum 'Purpurascens') is an improved variety of Dark opal basil that is believed to have originated in India. Like many culinary basils, it is a cultivar of Ocimum basilicum (sweet basil). This basil variety has unusual reddish-purple leaves, and a stronger flavor than sweet basil, making it most appealing for salads and garnishes. It is a fast-growing annual forb that reaches a height of approximately 45 cm (1.48 ft).