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 50-60 days 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.
Supergirl Quick Stats
THC
26%
Indica
88%
Sativa
12%
Autoflower
Yes
Flowering
50-60 days
Difficulty
intermediate
Indoor Yield
up to 550 g/m2
Outdoor Yield
up to 400 g/plant
Plant Height
70–110 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, 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 up to 550 g/m2 under quality LED, and outdoor plants given full sun and 5-7 gallon containers reliably produce up to 400 g/plant. Expected plant height is 70–110 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 offered in the Royal King Seeds catalog. Read the description on this page as a general profile rather than a guarantee of your specific pack; expect some phenotype variation between packs.
Where to Buy Supergirl Seeds in the USA
Supergirl seeds ship from Royal King Seeds from within the United States. Estimated delivery is approximately 5-7 business days; actual timing varies by destination and carrier.
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 50-60 days 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 from within the United States, with estimated delivery in approximately 5-7 business days. The product page is at https://royalkingseeds.us/supergirl-auto.