The shortest version: Blimburn Seeds's take on sativa genetics, 20-25% THC, 8-10 weeks flowering, moderate grow.

Blimburn Seeds lists this at $25.98 — the lowest base price in the comparison ($26.24 floor). Pack options: 3-seed at $25.98, 5-seed at $36.20, plus larger sizes.

Smell-first: crack a jar of this Blimburn autoflower and the citrus-skunk combo hits before you even get a trimming session going — sharp grapefruit peel up front, funky earth underneath. That aroma carries straight through to the smoke, which tests consistently in the 20–25% THC range without much CBD to soften the ride. Sativa structure means plants stay manageable — typically under a meter — and the autoflowering cycle wraps in 8–10 weeks from seed, no light-schedule juggling required.

Yields land around 400–500 g/m² indoors when plants get adequate light and a reasonable feed program; outdoor runs in warm climates can push similar numbers. Difficulty sits at moderate, so first-time auto growers may want a simpler strain for their debut run. Light LST during early veg helps open the canopy and improves bud site exposure. Best suited for daytime-use growers who want a fast-cycling, high-THC sativa without dedicating an entire season to it.

Genetics & Lineage

Grapefruit Auto traces its genetics to Grapefruit Auto (Blimburn Seeds). This sativa-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 Blimburn Seeds, 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 23%, this offers a well-balanced experience suitable for most users with some cannabis familiarity.

THC Level & Potency

Grapefruit Auto delivers THC levels of 20-25%, 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, starting as a cerebral buzz that gradually expands.

Growing Grapefruit Auto

Grapefruit Auto 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 8-10 weeks with yields of 400-500g/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

Grapefruit Auto features a fruity, citrus, skunky, earthy terpene profile that develops complexity throughout the flowering cycle. Sweet berry and grape notes dominate the inhale, with a sugary exhale that lingers on the palate. 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, Grapefruit 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 Grapefruit Auto?

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 Grapefruit Auto from Seennabis?

When you purchase Grapefruit Auto through Seennabis, you are buying directly from Blimburn Seeds — Barcelona-based breeder with one of the largest feminized + autoflower catalogs in Europe — over 1,200 strains spanning Spanish classics, exotic American hybrids (Banana Jelly x Permanent Marker, Skunk Berry, Glookies), and modern cookie/cake genetics. Every order includes verified genetics, discreet shipping, and responsive seller support.