Quick read: 16-20% THC, 60-120cm mature height, 8-10 weeks total bloom. Genetics: G13 Autoflower (ILGM genetics). Difficulty: easy.

Lineage: the legendary G13 cutting gets crossed into a ruderalis framework, trimming the grow window down to 8–10 weeks from seed to harvest without sacrificing much of what made the original strain worth talking about. THC tests typically land in the 16–20% range, and indoor growers working 1 m² can reasonably expect 450–600 g when light and feed schedules are dialled in. The high sits on the heavier, body-focused end of the indica spectrum — earthy and faintly sweet on the exhale, with a sedating finish that most people notice in the shoulders and eyes before anywhere else.

Because it runs on autoflower genetics, this one handles light-schedule mistakes and the occasional temperature swing better than most photoperiod indicas. Plants stay compact, which suits tent growers or anyone managing a discreet Canadian balcony setup through the short warm season. Rated easy — a solid pick for newer growers who want a high-resin indica without babysitting a finicky plant through a long flower stretch.

Genetics & Lineage

G13 traces its genetics to G13 Autoflower (ILGM genetics). This indica-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 ILGM, each seed is selected for genetic stability, terpene expression, and vigor.

Effects & Experience

Users report primarily relaxed and sleepy 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

G13 delivers THC levels of 16-20%, 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 5-10 minutes, settling into the body as a warm, heavy relaxation.

Growing G13

G13 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 8-10 weeks total with yields of 450-600g/m2. Plants typically reach 60-120cm 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 40-50% 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

G13 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, G13 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 G13?

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 G13 from Seennabis?

When you purchase G13 through Seennabis, you are buying directly from ILGM — I Love Growing Marijuana (ILGM) — the #1 beginner-friendly seed bank since 2012. Every order includes verified genetics, discreet shipping, and responsive seller support. ILGM has completed over 223 sales.