The SisterStrain, Effects, Genetics, Grow Guide & Where to Buy
Few cultivars carry the cult following The Sister has built across the US grow community , and the genetics live up to the reputation. It is a indica-dominant (77% indica / 23% sativa) testing at roughly 23% THC, with a flowering window of 50-60 days as an autoflower. What follows is a complete reference: terpene-led effects, genetic background, indoor and outdoor grow guidance, and the fastest way to get The Sister seeds shipped to your state.
The Sister Quick Stats
THC
23%
Indica
77%
Sativa
23%
Autoflower
Yes
Flowering
50-60 days
Difficulty
intermediate
Indoor Yield
up to 250 g/m2
Outdoor Yield
up to 300 g/plant
Plant Height
3-4 Ft. Medium
The SisterEffects & Experience
Reported effects center on euphoric, calm. The Sister pulls toward physical relaxation and a quiet, observational headspace, a profile that holds up across phenotypes when the seeds are grown to their potential.
Growing The Sister
Growing The Sister fits short outdoor seasons in the upper Midwest, Pacific Northwest, and Northeast, autoflower genetics finish in 70-90 days from seed regardless of latitude. The Sister 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 250 g/m2 under quality LED, and outdoor plants given full sun and 5-7 gallon containers reliably produce up to 300 g/plant. Expected plant height is 3-4 Ft. Medium, with intermediate cultivation difficulty. Practical tips that move the needle: defoliate strategically on day 21 of flower; remove fan leaves blocking interior bud sites without stripping the plant; and maintain canopy airflow with an oscillating fan moving air through the leaves, not just above them, to prevent powdery mildew. The most common challenge growers report is late-flower humidity if your indoor RH climbs above 55% during the final two weeks.
The SisterLineage & Genetics
This cultivar is part of the Royal King Seeds curated catalog. Read the description as a general profile rather than a guarantee of your specific pack.
Where to Buy The Sister Seeds in the USA
The Sister 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.
The Sister FAQ
Is The Sister indica or sativa?+
The Sister is a indica-dominant with a 77% indica / 23% sativa split. The effects lean toward physical relaxation and a calm, settled headspace.
How long does The Sister take to flower?+
The Sister 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 The Sister?+
The Sister tests at approximately 23% 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 The Sister good for beginner growers?+
The Sister 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 The Sister seeds in the USA?+
Royal King Seeds ships The Sister seeds from within the United States, with estimated delivery in approximately 5-7 business days. The product page is at https://royalkingseeds.us/the-sister-auto.