GrimaceStrain — Effects, Genetics, Grow Guide & Where to Buy in Canada
Grimace is a indica cannabis strain with 19% THC and a 8-10 weeks flowering period. It is known for euphoric and creative effects and grows best in indoor tents and cooler Canadian outdoor zones. Grimace seeds are sold at Royal King Seeds Canada with discreet Canada-wide shipping and a high-germination guarantee.
Grimace earned its place in the modern cannabis canon for a reason — and the appeal is easy to explain. It is a indica-dominant (79% indica / 21% sativa) testing at roughly 19%% 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 Grimace seeds delivered anywhere in Canada.
Grimace Quick Stats
THC
19%%
Indica
79%
Sativa
21%
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
GrimaceEffects & Experience
Grimace is best known for euphoric, creative, 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 Grimace
Growing Grimace fits indoor growers in compact spaces; indica genetics stay short and bushy without aggressive training. Grimace 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 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.
GrimaceLineage & 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 Grimace Seeds in Canada
Grimace 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.
Grimace FAQ
Is Grimace indica or sativa?+
Grimace is a indica-dominant with a 79% indica / 21% sativa split. The effects lean toward physical relaxation and a calm, settled headspace.
How long does Grimace take to flower?+
Grimace 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 Grimace?+
Grimace tests at approximately 19%% 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 Grimace good for beginner growers?+
Grimace 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 Grimace seeds in Canada?+
Royal King Seeds ships Grimace 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/grimace-feminized — checkout accepts standard cards and Interac.