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

Smell-first: crack a jar of OG #18 and you're hit with raw diesel and forest pine before any sweetness registers — that sequence tells you this is old Northern California, not a modern candy cross. NorCal Farms built this one from a 70/30 sativa-dominant frame, which shows in the stretchy canopy and the head-leaning effects that settle into something more grounded after an hour or so. At 20% THC and a realistic 500g/m² indoors, it earns its space on a grow shelf without requiring you to babysit it — 8 to 9 weeks of flower, moderate difficulty, and it runs fine outdoors too if your season cooperates.

The pine and diesel profile stays consistent across phenos rather than fading into generic "OG-ish" territory, which is the real argument for this one over cheaper alternatives. Good fit for intermediate growers who want a workhorse strain with enough character to stay interesting harvest after harvest.

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.