Buy Cannabis Seeds
in Canada

Feminized cannabis seeds are bred using controlled pollination techniques to produce exclusively female plants — the ones that develop the resinous, cannabinoid-rich flowers growers are after. With a 99.9% female plant success rate, feminized seeds eliminate the labor-intensive process of sexing plants and removing males, ensuring every seed in your garden has the potential to produce a harvestable yield. Most feminized strains flower in 8-12 weeks and produce yields of 400-600g/m² indoors. They remain the most popular seed type among Canadian home growers and form the backbone of our 1660+ strain catalog.

Autoflowering cannabis seeds contain ruderalis genetics that trigger flowering based on plant age rather than photoperiod changes, completing their entire lifecycle in just 8-10 weeks from germination. Most autoflowers stay compact at 60-100cm tall and yield 50-200g per plant outdoors or 300-500g/m² under indoor lighting.

For Canadian growers, autoflowers have become increasingly popular due to their ability to perform well in regions with limited sunlight and shorter outdoor seasons — particularly in Alberta, Manitoba, and Saskatchewan where frost-free windows average just 100-120 days. Read our autoflower growing guide for cultivation techniques specific to Canadian conditions.

For cultivators pursuing maximum cannabinoid concentration, our high THC seed collection features genetics testing between 20-30% THC — including Gorilla Glue #4 (up to 26% THC), Bruce Banner (up to 28% THC), and Girl Scout Cookies (up to 25% THC). These strains produce dense, trichome-saturated buds with yields averaging 450-550g/m² indoors under optimal conditions. High THC cannabis seeds generally require more precise environmental control — stable temperatures of 20-26°C, proper nutrient ratios, and adequate airflow — but reward experienced growers with competition-grade flower quality.

Canada spans USDA hardiness zones 0-8, creating vastly different growing conditions from coast to coast. British Columbia's coastal regions offer 180+ frost-free days ideal for large outdoor photoperiod plants, while Ontario's humid summers (70-80% RH in August) demand mold-resistant genetics. Alberta's dry prairies offer 2,500+ annual sunshine hours but only 100-120 frost-free days.

Outdoor growers should select fast-finishing strains that complete flowering by late September. Indoor growers in any province can cultivate year-round using LED or HPS lighting — our cannabis lighting guide and indoor growing guide cover setup, environment control, and nutrient management in detail.

Since the Cannabis Act (Bill C-45) came into effect in October 2018, Canadian adults can legally purchase cannabis seeds, grow up to four plants per household, and possess up to 30 grams in public. The legal age varies by province — 18 in Alberta, 21 in Quebec, and 19 everywhere else. Royal King Seeds ships legally within Canada to all provinces and territories. Learn more about buying cannabis seeds across Canada.

Not all cannabis seeds are created equal. High-quality marijuana seeds online come from stabilized genetics bred by experienced breeders over multiple generations. You can identify quality seeds by their appearance — mature seeds have a dark, tiger-striped shell that feels firm when pressed. At Royal King Seeds, we source exclusively from established breeding programs and store all seeds in climate-controlled conditions to preserve viability. Every batch is tested before it reaches our catalog, which is why we confidently offer our germination guarantee.

Canada spans six climate zones, and strain selection should match your local growing conditions. Growers in British Columbia benefit from a long outdoor season but need mold-resistant genetics for the rainy coast. Alberta and Saskatchewan growers should choose fast flowering cannabis seeds or autoflowers to beat early frost. Ontario and Quebec growers need humidity-tolerant strains for their warm, muggy summers. For northern territories, indoor cannabis seeds with compact growth habits are the only reliable option. Our cold-hardy seeds guide breaks down the best genetics for each Canadian region.

If you are new to growing cannabis, start with autoflowering seeds — they are the most forgiving, require no light schedule changes, and finish in 8-10 weeks. Best cannabis seeds for beginners include Northern Lights Auto, Blueberry Auto, and White Widow Auto. More experienced growers can explore feminized photoperiod seeds for greater yield control, or push the limits with high THC strains that reward skilled cultivation with extraordinary potency. Our beginner growing guide walks new growers through every step.

Autoflowering cannabis seeds have become the fastest-growing segment of the Canadian seed market — and for good reason. Canada's outdoor growing season is short in most provinces, with reliable frost-free windows of just 100-150 days. Autoflowers complete their entire lifecycle in 8-10 weeks regardless of daylight hours, making them the safest outdoor cannabis seeds for Canadian growers. They stay compact (60-100cm), making them ideal for balconies, small yards, and indoor grow tents. And because they flower automatically, they eliminate the complexity of managing light cycles — a key advantage for growers who want high yield cannabis seeds without the learning curve. Explore our full autoflower collection or read our autoflower growing guide.

Cannabis seed viability drops fast when stored in warm, humid, or fluctuating conditions — and Canadian basements with seasonal humidity swings are one of the worst storage environments. Keep seeds in an airtight container with silica gel packets, stored in your refrigerator (not freezer) at 4-8°C with relative humidity below 30%. Properly stored, our seeds remain viable for 3-5 years; viability is highest in the first 12-18 months. For Prairie growers, avoid storing seeds in unheated garages or sheds — the temperature swings from -30°C winter to +30°C summer destroy genetics within a single season. Our germination guidecovers what to do once you're ready to plant. Every order ships with a printed batch date so you can track freshness from day one.