King Louis XIIIStrain, Effects, Genetics, Grow Guide & Where to Buy
Few cultivars carry the cult following King Louis XIII has built across the US grow community , and the appeal is easy to explain. It is a indica-dominant (70% indica / 30% 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 King Louis XIII seeds shipped to your state.
King Louis XIII Quick Stats
THC
23%
Indica
70%
Sativa
30%
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
King Louis XIIIEffects & Experience
The dominant effects of King Louis XIII are happy, relaxed, sleepy, 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 King Louis XIII
Growing King Louis XIII fits shorter outdoor seasons, Pacific Northwest, New England, Great Lakes, where 7-9 week flowering finishes ahead of October rains. King Louis XIII 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: feed cal-mag from week 2 onward at 2-3 mL per gallon, most reverse-osmosis and soft tap water setups need it; and flush nutrients in the final 10-14 days for cleaner flavor; trichomes finish properly even on plain pH-adjusted water. The most common challenge growers report is training timing, top at the 4th node, not earlier and not later, for the best canopy distribution.
King Louis XIIILineage & 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 King Louis XIII Seeds in the USA
King Louis XIII 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.
King Louis XIII FAQ
Is King Louis XIII indica or sativa?+
King Louis XIII is a indica-dominant with a 70% indica / 30% sativa split. The effects lean toward physical relaxation and a calm, settled headspace.
How long does King Louis XIII take to flower?+
King Louis XIII 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 King Louis XIII?+
King Louis XIII 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 King Louis XIII good for beginner growers?+
King Louis XIII 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 King Louis XIII seeds in the USA?+
Royal King Seeds ships King Louis XIII 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/king-louis-xiii-feminized, checkout accepts standard cards, Apple Pay, and crypto.