10 Best Weed Strains To Grow In Ontario

Ontario's climate, characterized by warm summers and cold winters, offers a suitable environment for growing cannabis during the frost-free months.

The extended daylight hours during summer provide ample sunlight, while the region's rich soil and moderate rainfall contribute to favorable conditions for cannabis cultivation.

Taking this into consideration, here are 10 of the best strains to grow in Ontario.

Best strains to grow in Northern Ontario

1. Hindu Kush

If you're growing in Northern Ontario, Hindu Kush is like your ride-or-die strain. This pure Indica is practically built for the rugged outdoors, coming straight from the mountainous region between Afghanistan and Pakistan.

Hindu Kush thrives in various environments and laughs in the face of harsh conditions—perfect for Ontario’s fluctuating climate. For those who want to amp up their harvest, try organic soil and go bold with SOG or ScrOG techniques.

With an exotic aroma of citrus, pine, and incense, Hindu Kush brings both flavor and a chill vibe, making it a solid choice for Ontario growers.

2. Purple Urkle

Purple Urkle is a gem for Northern Ontario growers who want a mold-resistant, pest-resistant strain with style. 

This Indica-dominant hybrid may start slow, but it makes up for it by flying through its flowering phase, packing in sweet berry flavors and a lush, fruity aroma that’s hard to beat.

With its average THC hitting around 20%, Purple Urkle brings a kick but keeps things mellow, making it a top pick for greenhouses or indoor setups in Ontario’s cooler climate. A little patience is all it takes for this beauty to pay off big time.

3. Black Domina

For those in Northern Ontario, Black Domina is a powerhouse strain that knows how to make the most of a short growing season. 

With a flowering time of just 8-9 weeks, this compact plant, maxing out at 70 cm indoors and 120 cm outdoors, is ideal for urban and suburban growers who need to keep things low-key.

Expect hefty yields, from 550-600 grams per square meter indoors to up to 700 grams per plant outdoors.

With rich berry and pine notes topped with an earthy kush vibe, Black Domina brings both serious flavor and a serious harvest—perfect for Ontario’s summer sunshine.

4. G13

G13 is the legend you’ve been looking for if you're growing in Northern Ontario. With a THC content hitting around 24%, this strain packs a punch and delivers hefty yields, making it a no-brainer for both newbies and seasoned growers.

Ontario's warm summers and mild falls set the perfect stage for G13 to thrive, especially since it laughs in the face of pests and mold.

With earthy, woody flavors, hints of sweet berry, and a skunky twist, G13 is as flavorful as it is mysterious—perfect for those who want big results with a side of intrigue.

5. Bubblegum

Bubblegum is the sweet choice for Northern Ontario growers looking for a crowd-pleaser. This hybrid strain brings a candy-like aroma that’ll have your grow space smelling like a fruity gum factory, with flavors of berries and grapes to match. 

Bubblegum thrives in moderate to warm summer conditions, and if you're growing indoors, you'll have the advantage of dialing in that ideal dry environment it loves. Compact and easy to manage, this strain is perfect for newbies and pros alike.

With a balanced high that lifts you up while keeping you mellow, Bubblegum is a solid pick for a flavorful Ontario harvest.

Best Strains To Grow In Southern Ontario

1. Tangie

Tangie is a top pick for Southern Ontario growers who crave a punch of citrus in their garden. This Sativa strain shines during Ontario's temperate summers, thriving in that sweet 20-30°C range.

Known for its tangerine aroma with a Skunky twist, Tangie packs up to 22% THC, bringing an energetic and uplifting high. With a harvest window around September to October, Tangie makes the most of the season.

Greenhouse growers will love how it stretches out with ample lateral space, delivering a burst of zesty, sun-kissed flavor in every bud.

2.  White Widow

White Widow is a true Dutch classic that’s right at home in Southern Ontario's warm summers. This hybrid thrives outdoors here, reaching up to 2 meters in height and yielding up to 700 grams per plant—a hefty reward for any grower.

Plant in May or June, and by early autumn, you’ll be harvesting some serious buds. Known for its earthy, herbal aroma with a dash of spiciness, White Widow’s effects bring a rush of euphoria and a creative boost, perfect for those mellow, sociable days.

With its robust, easygoing nature, White Widow is a top choice for growers across the board.

3. Chemdawg

Chemdawg is a top pick for Southern Ontario growers seeking high yields and potent buds, with THC levels reaching up to 21%.

This Sativa-dominant strain shines in controlled environments, making it perfect for indoor or greenhouse cultivation where you can keep humidity in check and avoid mold issues.

With the right care, expect up to 600 grams per plant outdoors or 500 grams per square meter indoors.

Its intense pine, diesel, and citrus aroma is unforgettable, and the uplifting, mood-boosting high makes Chemdawg a go-to for social gatherings and creative moments.

4. AK-47

AK-47 is a knockout choice for Southern Ontario growers, offering both high yields and an unmistakable aroma. This Sativa-dominant hybrid brings a skunky, earthy profile with hints of wood and sweet fruit, and even a dash of licorice.

With medium height (80-140 cm) and impressive mold resistance, AK-47 is adaptable for both indoor and outdoor grows. Expect generous yields—450 to 550 grams per square meter indoors or a hefty 600 to 800 grams per plant outdoors.

Its effects are potent yet balanced, delivering a long-lasting, uplifting high that’s perfect for kicking back or sparking some creativity.

5. Blueberry CBD

Blueberry CBD is a stellar choice for Southern Ontario growers who want a hardy, easy-to-grow strain with a smooth blueberry flavor. This plant stands up to the region’s colder spells and even tolerates late frosts, making it a reliable pick for outdoor gardens.

With a compact height maxing out at 160 cm and yields reaching up to 450 grams per plant in sunny spots, Blueberry CBD is perfect for manageable, productive grows.

Its sweet, woody aroma with a hint of pine rounds out the experience, making this high-CBD strain a flavorful, relaxed addition to any garden.