From the lab panel — 26% THC, <2% CBD. From Canadian grower reports — 300g/m2 yield, earthy/sweet dominant in cured flower. easy grow.

Smell-first: the cure jars on 303 OG Auto open to damp forest floor and a faint brown-sugar sweetness — not flashy, but the kind of aroma that signals a well-rounded smoke rather than a one-trick terp profile. Amsterdam Seeds Company keeps the lineage close to the chest, but the results are measurable: 26% THC in a plant that finishes in 9–10 weeks from seed and pulls around 300 g/m² under reasonable light. Plants stay compact enough for a basement tent or a sheltered patio run in BC or Ontario, and the autoflowering format means you're not chasing light schedules through a Canadian summer.

What stands out here is how forgiving it is. Beginners who've lost a photoperiod crop to a scheduling mistake will appreciate a strain that just gets on with it. That said, if you push conditions — dialled VPD, good airflow — the yield and potency both respond.

Best suited to first-time auto growers who want a straightforward run without sacrificing THC numbers.

Genetics & Lineage

303 OG Auto traces its genetics to Proprietary cross (Amsterdam Seeds Company). This hybrid-dominant autoflower seed produces plants that express the best traits of its parent lineage, delivering consistent results for growers of all experience levels. Bred by Amsterdam Seeds Company, 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 26%, this is a potent strain recommended for experienced users — newcomers should start low and go slow.

THC Level & Potency

303 OG Auto delivers THC levels of 26%, placing it in the high-potency category alongside powerhouses like Gorilla Glue and Girl Scout Cookies. 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 303 OG Auto

303 OG Auto is rated as easy difficulty, making it an excellent choice for first-time growers. The plants are resilient, forgiving of common mistakes like overwatering or inconsistent feeding schedules.

Indoor Growing: Expect a flowering time of 9-10 weeks with yields of 300g/m2. Plants typically reach 60-100cm indoors. Standard training techniques like topping and LST will help manage height and improve light penetration. 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 dense flower formations.

Flavor, Aroma & Terpene Profile

303 OG Auto features a earthy, sweet terpene profile that develops complexity throughout the flowering cycle. A smooth, candy-like sweetness defines the flavor, with subtle complexity on the exhale. 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, 303 OG Auto 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 303 OG Auto?

This strain is ideal for beginner growers looking for a reliable, low-maintenance plant that delivers consistent results without advanced techniques. If you're looking for evening relaxation and deep stress relief, this is your strain.

Why Buy 303 OG Auto from Seennabis?

When you purchase 303 OG Auto through Seennabis, you are buying directly from Amsterdam Seeds Company — Dutch breeder carrying Amsterdam coffee shop classics plus modern crosses (RS11, Zkittlez, Runtz). Every order includes verified genetics, discreet shipping, and responsive seller support.