"Private Reserve" (PR) in cannabis refers to top-tier, high-quality flower, often a specific phenotype of strains like OG Kush (OG #18), known for potent THC levels (often 20-30%+), rich flavors (earthy, diesel), and deep relaxation, suitable for experienced users, though CBD is usually low unless it's a specific oil blend. Reviewers praise its powerful effects, while testing shows THC dominance, with minor cannabinoids like CBG/CBN adding complexity, justifying its premium price for discerning consumers.