SupergirlStrain, Effects, Genetics, Grow Guide & Where to Buy
Among the strains American growers consistently come back to, Supergirl sits near the top of the list, but the data behind the hype is what holds growers' attention. It is a indica-dominant (88% indica / 12% sativa) testing at roughly 26% THC, with a flowering window of 8-10 weeks from seed as an autoflower. On this page we cover the effects, the lineage, the grow profile, and where to buy Supergirl seeds in the United States with discreet shipping and a 95% germination guarantee.
Supergirl Quick Stats
THC
26%
Indica
88%
Sativa
12%
Autoflower
Yes
Flowering
8-10 weeks from seed
Difficulty
intermediate
Indoor Yield
450-550 g/m²
Outdoor Yield
500-700 g/plant
Plant Height
60-100 cm
SupergirlEffects & Experience
The dominant effects of Supergirl are relaxed, sleepy, happy, and the experience is more nuanced than a simple high/low/sedating label would suggest. Onset is gradual rather than abrupt, the peak holds for roughly an hour, and the comedown is smooth, which is why this strain shows up in so many "daily driver" lists from experienced consumers.
Growing Supergirl
Growing Supergirl fits guerrilla growers and balcony cultivators across all 50 states, since the plant ignores light cycle and finishes before fall rains arrive. Supergirl runs on an 18/6 light schedule from seed to harvest, autoflower genetics ignore photoperiod, so there is no flip and no light-cycle change. Indoor yields land around 450-550 g/m² under quality LED, and outdoor plants given full sun and 5-7 gallon containers reliably produce 500-700 g/plant. Expected plant height is 60-100 cm, with intermediate cultivation difficulty. Practical tips that move the needle: maintain canopy airflow with an oscillating fan moving air through the leaves, not just above them, to prevent powdery mildew; and feed cal-mag from week 2 onward at 2-3 mL per gallon, most reverse-osmosis and soft tap water setups need it. The most common challenge growers report is over-feeding nitrogen past week 1 of flower, switch to bloom nutrients within 7 days of seeing pistils.
SupergirlLineage & Genetics
Supergirl is a Royal King Genetics in-house cross. The parental selection was chosen for compact stature and resin density, then stabilized over multiple generations to lock in phenotype expression. Seeds run true to the description on this page rather than spreading across a wide range of expressions.
Where to Buy Supergirl Seeds in the USA
Supergirl seeds ship from Royal King Seeds to all 50 US states with discreet packaging and a 95% germination guarantee. Average delivery is 3-5 business days, with the fastest routes typically reaching Alaska, Arizona, Arkansas, California, Colorado.
Supergirl FAQ
Is Supergirl indica or sativa?+
Supergirl is a indica-dominant with a 88% indica / 12% sativa split. The effects lean toward physical relaxation and a calm, settled headspace.
How long does Supergirl take to flower?+
Supergirl flowers in 8-10 weeks from seed from seed, since autoflower genetics ignore light cycle. Outdoor harvest typically lands 70-90 days after planting.
What is the THC content of Supergirl?+
Supergirl tests at approximately 26% THC when grown to its potential. Real-world numbers depend on grow conditions, harvest timing, and curing, well-grown phenotypes can land at the high end of that range, while poorly cured flower tests lower.
Is Supergirl good for beginner growers?+
Supergirl is rated intermediate difficulty. The autoflower genetics simplify the process, no light schedule changes and a fast seed-to-harvest timeline make it forgiving for first-time growers. Most growers with one harvest behind them handle this strain without difficulty.
Where can I buy Supergirl seeds in the USA?+
Royal King Seeds ships Supergirl seeds to all 50 US states with discreet packaging, 3-5 day delivery, and a 95% germination guarantee. The product page is at https://royalkingseeds.us/supergirl-auto, checkout accepts standard cards, Apple Pay, and crypto.