At times, citrus-tasting cannabis strains can be overwhelmingly sour or bitter, such as strains that taste like grapefruit. One of the most popular citrus flavors comes from lemon terpene limonene. Limonene is directly responsible for the pungent and upfront flavor of juniper, rosemary, and lemon. Cannabis seeds that contain citrus-like tastes are the current trend-setters for the marijuana industry.