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 appeal is easy to explain. It is a indica-dominant (77% indica / 23% sativa) testing at roughly 23% THC, with a flowering window of 7–9 weeks under a 12/12 photoperiod. 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
No
Flowering
7–9 weeks
Difficulty
intermediate
Indoor Yield
150–250 g/m²
Outdoor Yield
350–650 g/plant
Plant Height
160–200 cm
The SisterEffects & Experience
The Sister is best known for euphoric, calm. The effects come on within the first 10 minutes and settle into a stable plateau that lasts 90 minutes to two hours at typical doses. Growers and users consistently note that the high stays true to its profile rather than drifting, what you feel in the first 20 minutes is what you have for the next 90.
Growing The Sister
Growing The Sister fits cooler climates and high-altitude growers, where the compact structure resists wind and the short flower beats early frost. The Sister is photoperiod, which means you control when it flowers by switching from 18/6 (vegetative) to 12/12 (flowering). Most indoor growers veg for 4-6 weeks before the flip. Indoor yields land around 150–250 g/m² under quality LED, and outdoor plants given full sun and 5-7 gallon containers reliably produce 350–650 g/plant. Expected plant height is 160–200 cm, with intermediate cultivation difficulty. Practical tips that move the needle: top once at the 4th node to encourage 4-6 even main colas instead of one dominant cola; 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 training timing, top at the 4th node, not earlier and not later, for the best canopy distribution.
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 7–9 weeks once you flip to 12/12 light cycle. Outdoor harvest typically lands in late September to mid-October across most US zones.
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. Photoperiod genetics give you control over plant size and harvest timing, which means a bit more responsibility for getting the schedule right. 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-feminized.