Indoor Grown Infused with Liquid Diamonds & Kief . Fire OG is a Hybrid of Raskal’s OG Kush and an F3 SFV OG Kush variety first bred by the team at Cali Connection and now available at Dark Heart Nursery. The cultivar features vibrant green nugs with copious red pistils, giving it a firelike appearance, though the name also describes its high-quality smoke. This strain has an aroma similar to Lemon Pledge and has euphoric effects that are potent and long-lasting. Fire OG is one of the strongest OG strains and is a fan favorite among consumers who have a high THC tolerance.