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

Amsterdam Seeds Company lists this at $30.44 — the lowest base price in the comparison ($30.62 floor). Pack options: 3-seed at $30.44, 5-seed at $44.99, plus larger sizes.

Smell-first: crack open a jar of 303 OG Auto and the room fills with damp soil and a faint brown-sugar sweetness that doesn't quit. Amsterdam Seeds Company keeps the exact lineage close to the chest, but the result speaks clearly — 26% THC in an autoflowering plant that wraps up in 9 to 10 weeks from seed without much coaxing. Yields sit around 300g/m², which is respectable for a compact auto that fits equally well under a tent light or on a sunny patio. The high leans cerebral early on, then settles into something more relaxed as the session goes on.

Difficulty is rated easy, so new growers aren't fighting the plant to get there. No complicated feed schedules or climate dialing required. If you want a fast-finishing, high-THC auto that works indoors or out and doesn't punish beginner mistakes, this one fits the bill.

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.