The specs in one line: 20% THC, <2% CBD, 8-9 weeks flowering, 500g/m2 reported. Best indoor or outdoor. moderate grow.

Lineage: NorCal Farms' OG #18 traces back through California's underground OG pool, running 70% sativa-dominant with just enough indica structure to keep plants manageable at 100–160 cm. The nose is unmistakably diesel up front, with pine cutting through mid-exhale and a faint sweetness rounding the finish — straightforward and true to its roots.

Indoors it reliably pushes around 500 g/m² after an 8–9 week flower period, and the feminized format means you're not pulling males from the crop. It handles both indoor and outdoor runs without fuss, though outdoor growers in shorter Canadian seasons should start under lights to hit that flower window before September temps drop. Difficulty sits at moderate — you'll want some grow cycles under your belt, but nothing about this plant requires advanced techniques. At 20% THC with CBD under 2%, the effect profile leans active rather than sedating. A solid pick for experienced home growers who want a classic West Coast nose without chasing boutique genetics.

Genetics & Lineage

OG #18 traces its genetics to 70% Sativa/30% Indica (NorCal Farms). This hybrid-dominant feminized seed produces plants that express the best traits of its parent lineage, delivering consistent results for growers of all experience levels. Bred by NorCal Farms, each seed is selected for genetic stability, terpene expression, and vigor.

Effects & Experience

Users report primarily relaxed and euphoric effects, making this strain ideal for evening use and unwinding after a long day. The body-centered stone builds gradually, easing tension and promoting deep physical relaxation. With THC levels reaching 20%, this offers a well-balanced experience suitable for most users with some cannabis familiarity.

THC Level & Potency

OG #18 delivers THC levels of 20%, placing it in the moderate-to-strong range that most regular consumers find comfortable. CBD content is minimal, so the psychoactive effects are front and center. The onset typically arrives within minutes with a balanced head-and-body experience that evolves over time.

Growing OG #18

OG #18 is rated as moderate difficulty, making it suitable for growers with some experience. Basic knowledge of nutrient schedules, pH management, and environmental controls will help maximize results.

Indoor Growing: Expect a flowering time of 8-9 weeks with yields of 500g/m2. Plants typically reach 100-160cm indoors. This strain responds exceptionally well to SCROG (Screen of Green) and LST (Low Stress Training), which can boost yields significantly. Maintain temperatures between 68-80°F with relative humidity around 45-55% during flowering.

Outdoor Growing: This versatile strain performs well in both indoor and outdoor environments. Outdoor growers in warm climates can expect harvest from late September through October. Watch for humidity during late flowering to prevent bud rot, especially with the dense, heavy buds this strain produces.

Flavor, Aroma & Terpene Profile

OG #18 features a diesel, pine, sweet terpene profile that develops complexity throughout the flowering cycle. Pungent fuel and chemical notes hit first, followed by an earthy, musky undertone. The aroma intensifies significantly during the final 2-3 weeks of flowering — carbon filtration is recommended for indoor grows requiring discretion.

Medical Benefits

While individual experiences vary, OG #18 is commonly reported to help with stress relief, chronic pain, insomnia, and muscle tension. The deeply relaxing effects make it a popular choice among medical users seeking nighttime relief. As with any cannabis strain, start with a low dose and increase gradually. Consult a healthcare professional before using cannabis for medical purposes.

Who Should Grow OG #18?

This strain is ideal for intermediate growers ready to push their skills and be rewarded with superior results. If you're looking for evening relaxation and deep stress relief, this is your strain.

Why Buy OG #18 from Seennabis?

When you purchase OG #18 through Seennabis, you are buying directly from NorCal Farms — Northern California craft farm specializing in sun-grown sativas and hybrids. Every order includes verified genetics, discreet shipping, and responsive seller support.