The SisterStrain — Effects, Genetics, Grow Guide & Where to Buy in Canada
The Sister is a indica cannabis strain with 23% THC and a 8-10 weeks flowering period. It is known for euphoric and calm effects and grows best in indoor tents and cooler Canadian outdoor zones. The Sister seeds are sold at Royal King Seeds Canada with discreet Canada-wide shipping and a high-germination guarantee.
Few cultivars carry the cult following The Sister has built across the Canadian 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 8-10 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 province.
The Sister Quick Stats
THC
23%%
Indica
77%
Sativa
23%
Autoflower
No
Flowering
8-10 weeks
Difficulty
intermediate
Indoor Yield
450-550 g/m²
Outdoor Yield
500-700 g/plant
Plant Height
120-180 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 Canadian 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 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 120-180 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 comes from the Royal King Genetics breeding program — an in-house line developed for fast finishing and heavy yields under indoor conditions. Phenotype consistency is the result of multiple generations of selection rather than commercial seed-run breeding.
Where to Buy The Sister Seeds in Canada
The Sister seeds ship from Royal King Seeds to every Canadian province and territory with discreet packaging and a high-germination guarantee. Average delivery is 3-7 business days, with the fastest routes typically reaching British Columbia, Manitoba, New Brunswick, Newfoundland and Labrador, Northwest Territories.
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 8-10 weeks once you flip to 12/12 light cycle. Outdoor harvest typically lands in late September to mid-October across most Canadian growing 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 Canada?+
Royal King Seeds ships The Sister seeds to every Canadian province and territory with discreet packaging, tracked delivery, and a high-germination guarantee. The product page is at https://royalkingseeds.ca/the-sister-feminized — checkout accepts standard cards and Interac.