The specs in one line: 16-20% THC, <1% CBD, 8-9 weeks flowering, 450-500g/m² reported. Best indoor or outdoor. moderate grow.

Royal Queen Seeds lists this at $28.19 — below the median of $31.50 across 10 listings. Pack options: 3-seed at $28.19, 5-seed at $42.77, plus larger sizes.

Lineage: Purple Urkle × Big Bud — two California-rooted strains that together push this indica toward the sweeter, heavier end of the spectrum. Purple Urkle carries the Mendocino Purps bloodline, responsible for that deep grape-and-berry nose, while Big Bud (Afghan/Skunk descent) does the heavy lifting on structure and output. The result finishes in 8–9 weeks and can yield 450–500g/m² under good light, which is solid for a feminized indica that runs 75% that direction. THC tests typically land between 16–20%, so this isn't a lightweight, but it's not an overwhelming ceiling either — there's real room to work with depending on harvest timing and cure.

Moderate difficulty means first-time growers can manage it, though anyone who's run a finicky purple strain before will appreciate how forgiving the Big Bud side keeps the structure. Works indoors or out. Best suited for growers chasing a grape-forward smoke without wrestling a temperamental plant to get there.

Genetics & Lineage

Granddaddy Purple traces its genetics to Purple Urkle x Big Bud. This indica-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 Royal Queen Seeds, 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

Granddaddy Purple 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 Granddaddy Purple

Granddaddy Purple 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 450-500g/m². Plants typically reach 70-120cm 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 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 dense flower formations.

Flavor, Aroma & Terpene Profile

Granddaddy Purple features a fruity, sweet 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, Granddaddy Purple 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 Granddaddy Purple?

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 Granddaddy Purple from Seennabis?

When you purchase Granddaddy Purple through Seennabis, you are buying directly from Royal Queen Seeds — One of Europe's largest and most trusted seed banks, founded in Amsterdam in 2008. Every order includes verified genetics, discreet shipping, and responsive seller support. Royal Queen Seeds has completed over 257 sales.