RS11 Strain — Effects, Genetics, Grow Guide & Where to Buy
RS11 is one of the most-searched cannabis strains in the United States, with a profile that holds up under scrutiny. It is a indica-dominant (77% indica / 23% sativa) testing at roughly 27% THC, with a flowering window of 8-10 weeks under a 12/12 photoperiod. This guide pulls together the lineage, the effects, the grow data, and the practical answer to "where can I buy RS11 seeds in the USA" in one place.
RS11 Quick Stats
THC
27%
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
RS11 Effects & Experience
Reported effects center on uplifted, calm. RS11 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 RS11
Growing RS11 fits shorter outdoor seasons — Pacific Northwest, New England, Great Lakes — where 7-9 week flowering finishes ahead of October rains. RS11 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: 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.
RS11 Lineage & Genetics
RS11 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 RS11 Seeds in the USA
RS11 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.
RS11 FAQ
Is RS11 indica or sativa?+
RS11 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 RS11 take to flower?+
RS11 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 US zones.
What is the THC content of RS11?+
RS11 tests at approximately 27% 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 RS11 good for beginner growers?+
RS11 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 RS11 seeds in the USA?+
Royal King Seeds ships RS11 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/rs11-feminized — checkout accepts standard cards, Apple Pay, and crypto.