AmsterdamStrain — Effects, Genetics, Grow Guide & Where to Buy in Canada
Amsterdam is a hybrid cannabis strain with 18% THC and a 8-10 weeks flowering period. It is known for happy and creative effects and grows best in both indoor tents and warm outdoor climates. Amsterdam seeds are sold at Royal King Seeds Canada with discreet Canada-wide shipping and a high-germination guarantee.
Amsterdam earned its place in the modern cannabis canon for a reason — and the genetics live up to the reputation. It is a balanced hybrid (62% indica / 38% sativa) testing at roughly 18%% 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 Amsterdam seeds delivered anywhere in Canada.
Amsterdam Quick Stats
THC
18%%
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
AmsterdamEffects & Experience
The dominant effects of Amsterdam are happy, creative, focused, 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 Amsterdam
Growing Amsterdam fits temperate and southern Canadian zones — coastal BC, Southern Ontario, and the Niagara region with mild September weather. Amsterdam 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 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 late-flower humidity if your indoor RH climbs above 55% during the final two weeks.
AmsterdamLineage & 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 Amsterdam Seeds in Canada
Amsterdam 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.
Amsterdam FAQ
Is Amsterdam indica or sativa?+
Amsterdam 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 Amsterdam take to flower?+
Amsterdam 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 Amsterdam?+
Amsterdam tests at approximately 18%% 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 Amsterdam good for beginner growers?+
Amsterdam 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 Amsterdam seeds in Canada?+
Royal King Seeds ships Amsterdam 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/amsterdam-feminized — checkout accepts standard cards and Interac.