Opium Strain — Effects, Genetics, Grow Guide & Where to Buy
Opium earned its place in the modern cannabis canon for a reason — and the appeal is easy to explain. It is a balanced hybrid (62% indica / 38% sativa) testing at roughly 21% THC, with a flowering window of 8-10 weeks under a 12/12 photoperiod. Below we walk through what to expect from the high, how the plant grows in a tent or outdoor garden, the parental genetics behind the cultivar, and how to get Opium seeds delivered anywhere in the US.
Opium Quick Stats
THC
21%
Indica
62%
Sativa
38%
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
Opium Effects & Experience
The dominant effects of Opium are euphoric, calm, 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 Opium
Growing Opium fits indoor tent growers running standard 4x4 setups; the hybrid frame responds well to topping and LST. Opium 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: defoliate strategically on day 21 of flower; remove fan leaves blocking interior bud sites without stripping the plant; and apply low-stress training in week 2 of veg — bend the main stem horizontally and tie down to expose lower nodes. The most common challenge growers report is training timing — top at the 4th node, not earlier and not later, for the best canopy distribution.
Opium Lineage & Genetics
This cultivar comes from the Royal King Genetics breeding program — an in-house line developed for consistent results across both indoor and outdoor environments. Phenotype consistency is the result of multiple generations of selection rather than commercial seed-run breeding.
Where to Buy Opium Seeds in the USA
Opium 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.
Opium FAQ
Is Opium indica or sativa?+
Opium is a balanced hybrid with a 62% indica / 38% sativa split. The effects lean toward physical relaxation and a calm, settled headspace.
How long does Opium take to flower?+
Opium 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 Opium?+
Opium tests at approximately 21% 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 Opium good for beginner growers?+
Opium 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 Opium seeds in the USA?+
Royal King Seeds ships Opium 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/opium-feminized — checkout accepts standard cards, Apple Pay, and crypto.