Many Canadians—especially those seeking deep physical relaxation, pain relief, or better sleep—are gravitating toward High THC Indica strains. Whether you’re a seasoned cannabis user or a curious newcomer, understanding THC levels and strain types is essential.
In this guide, we’ll break down everything you need to know about Indicas with high THC content: what they are, what “high THC” really means in today’s market, the potential benefits and risks, and our curated list of top strains available in Canada. This guide is designed to help you make a more informed, confident choice.
What Is Indica Strain?
Cannabis strains are typically categorized as Indica, Sativa, or Hybrid. Indica strains are derived from the Cannabis indica plant, traditionally found in Southern Asian regions. These plants tend to be bushier, with broad, dark green leaves and a faster flowering cycle compared to Sativas.
Indica strains are known for their calming, sedative effects, making them ideal for evening or before bed. They are typically associated with strong body high, stress reduction, pain relief and insomnia support. By contrast, Sativa strains are known for producing more of a head high, often described as uplifting, energizing, and mentally stimulating.
What is THC
THC, short for tetrahydrocannabinol, is the primary psychoactive compound in cannabis—the one responsible for the intoxicating “high” users experience. It interacts with receptors in your brain and nervous system, producing effects like euphoria, relaxation, altered perception of time, and increased appetite.
In high concentrations, THC can also lead to impaired coordination, memory issues, anxiety, or paranoia, particularly in those sensitive to its effects.
All cannabis strains—whether Indica, Sativa, or Hybrid—contain varying levels of THC depending on their genetics, cultivation methods, and processing. In Indica strains, THC often combines with calming terpenes (like myrcene) to produce a strong, relaxing body effect rather than cerebral stimulation often associated with Sativas.
Does Indica have less THC than Sativa?
There is no inherent difference in THC levels between Indica and Sativa strains. The THC content depends on how the strain is bred, not whether it’s a sativa, indica or hybrid.
While cannabinoid ratios—such as THC to CBD—can vary significantly between strains, Indica strains tend to have a higher THC to CBD ratio on average, whereas some Sativas or hybrids may have more balanced or CBD-rich profiles.
You can’t determine THC levels just by looking at whether a strain is labeled “sativa” or “indica.” In fact, market trends and selective breeding have influenced THC levels more than plant type. The only reliable way to assess potency is to check the lab-tested cannabinoid profile on the product label or certificate of analysis (COA).
What Is Considered High THC Indica Strains?
High THC levels refer to cannabis strains and products with THC concentrations significantly higher than average. The threshold for what’s considered “high” can vary depending on the product type, but in general, THC levels above 25% are considered high for dried flower, including Indica strains.
Most cannabis experts agree that cannabis flowers —whether indica or sativa—have a biological THC ceiling of around 30%-35%, although some argue it could be pushed slightly higher with selective breeding.
Here is a breakdown of product types and what constitutes high THC in Canada:
Flower (including pre-rolls)
Average THC concentration: 20%-25%
High THC: Above 25%
Vapes
Average THC: 80-85%
High THC: Above 85% (Some cannabis vaping products contain over 90% THC concentration)
Edibles & Beverage
Regulatory maximums: 10 mg per pack, though some lozenges and specific edible products contain 10mg THC/unit making for 100mg/pack or more.
Concentrates (Indica-specific)
Average Hash THC 35-45%
High Hash THC: Above 45%
Rsing, Shatter, Live Resin: Often 60%–90% THC, depending on the product
Rising THC Levels Over Time
It’s important to note that average reported THC levels have increased over the decades. In the 1990s, the average THC level for cannabis flowers was around 4%. By 2017, it had risen to around 17%, and today, some Indica flower strains in Canada exceed 30% THC, depending on genetics, cultivation and curing methods.
This upward trend means that what is considered high THC in Canada now may not be considered high THC in the future. Additionally, the topic of THC percentage can be arbitrary because there is no standardised form of testing for THC percentage and so products can be manipulated and different lab standards applied to attain higher stated THC percentages. Furthermore, it is believed that a consumer’s experience of cannabis is based not just on the THC concentration, but on the synergistic interaction between cannabinoids (ie THC), terpenes, flavonoids and other such cannabis compounds.
THC Laws and Regulations in Canada
Canada has not set a legal limit on the maximum THC content allowed in dried cannabis flowers or other cannabis products for recreational or medical purposes. However, there are specific limits for certain types of cannabis products:
- Edibles, Beverages, and Topicals: Max 10 mg THC per package (with some exception for certain capsules/lozenges).
- Cannabis Extracts and Concentrates (e.g., oils, vape cartridges): There is no THC limit, but for regulatory purposes, 7.5 grams of extracts/concentrates count as 30 grams of dried flower, which is the maximum amount allowed in public.
It’s important to remember the legal age for purchasing, possessing, and consuming cannabis. While the federal legal age is 18, most provinces have set it at 19, with strict penalties for providing cannabis to minors. Always check your provincial laws and avoid sharing cannabis with minors.
Effects, Benefits, and Risks of High THC Indica Strains
High THC Indica strains are typically chosen for their deep body relaxation, sedative effects, and support for pain or sleep-related issues. These effects become even more pronounced when THC levels are high, particularly in strains rich in calming terpenes like myrcene and linalool.
These High THC Indica Strains are especially popular for evening use, offering a grounding, full-body high that can feel sedative and therapeutic. That said, the overall experience can vary significantly depending on factors such as individual tolerance, strain genetics, dosage, and method of consumption.
Potential Effects and Benefits
- Heavy Physical Sedation: often referred to as a “Couch-lock” sensation. May assist with insomnia, restlessness, or nighttime anxiety.
- Euphoria with mental calmness – creates a peaceful state that reduces tension and promotes relaxation
- Increased Appetite: THC can stimulate hunger, which is helpful for people dealing with appetite loss or nausea.
- Muscle Relaxation and Pain Relief: Often used for chronic pain, spasms, or physical tension.
It is important again to note that potency and overall experience are also influenced by other compounds like terpenes, so high THC alone does not fully characterise a strain’s effects.
Medical Benefits
High THC indica – like their sativa counterparts- have shown to have certain medical benefits when used under proper guidance. These include:
- Chronic Pain Management: may help alleviate persistent pain in conditions like arthritis, fibromyalgia, or physical injury.
- Insomnia and Sleep Disorders: High THC indica strains are commonly chosen by patients seeking to improve sleep latency.
- Muscle Spasms and Spasticity: may help reduce muscle stiffness and spasm, particularly in patients with multiple sclerosis.
- Anxiety and Stress Relief – While high doses of THC can induce anxiety in some people, low to moderate doses of high-THC strains have been used successfully to manage generalized anxiety.
- Appetite Stimulation: commonly used to treat cachexia, anorexia, or appetite loss associated with cancer, HIV/AIDS, or eating disorders.
While studies and anecdotal reports support the potential benefits of High THC Indica Strains, individual responses can vary widely. Factors such as personal THC tolerance, the specific cannabinoid and terpene profile of the strain, and underlying health conditions can influence effectiveness. Always consult with a healthcare professional experienced in cannabis therapeutics before using high-THC products—especially for medical purposes.
Risks
While high-THC Indicas and Sativas can provide meaningful therapeutic benefits,, they also come with increased risks —especially for inexperienced users or those prone to psychosis, bipolar disorder, or anxiety disorders. These risks tend to be more pronounced at higher THC concentrations. Risks include:
- Adverse psychiatric effects like anxiety, paranoia, and psychosis, especially in vulnerable populations such as adolescents and those with pre-existing mental health conditions. (However, some cannabis strains high in CBD may potentially help treat anxiety.)
- Respiratory issues like bronchitis if smoked.
- Impairments in cognition, coordination, and perception, which can impact driving and other activities. Indica strains, already known for their sedative effects (due to terpenes like myrcene), may amplify this impairment when combined with high THC—sometimes leading to next-day grogginess or a “cannabis hangover.”
- Increased risk of developing a tolerance or dependence on high THC products.
- Potential for cannabinoid hyperemesis syndrome, characterised by severe vomiting and nausea with chronic, high-dose use.
Moderation is therefore highly advised, especially for recreational users. High-THC cannabis in Canada should be avoided by adolescents, pregnant women, and those with certain risk factors or pre-existing conditions. Always consult with a healthcare provider, especially if you’re using cannabis alongside other medications or managing a health condition.
High THC Strains We Recommend
Thousands of high-THC strains have been developed over the years through cross-breeding and genetic selection, with new ones continuously emerging. It’s important to remember that other compounds, like terpenes, also influence a strain’s effects, so high THC alone doesn’t determine its impact. Here are some of our curated favourite high-potency, high-THC cannabis flowers in Canada, featuring various types, THC levels, flavours, and effects:
Note: THC percentages can vary widely by brand. The ranges provided here are based on information from the packaging of products sold via the Ontario Cannabis Store (OCS) and are intended to give a general idea of potential THC levels.
Indica
Death Bubba
THC: 24-30%
Cross: Death Star and Bubba Kush.
Flavour: Pungent skunk and pine aroma.
Effects: Relief from insomnia, stress and pain. Stimulates appetite.
Alien Bubba
THC: 18-24%
Cross: Alien Kush and Bubba Kush.
Flavour: Earthy, tea, and nutty.
Effects: Deep relaxation, euphoria and stress relief.
Ice Cream Cake
THC: 20-26%
Cross: Wedding Cake and Gelato #33
Flavour: Sweet, creamy, vanilla, and buttery.
Effects: Sedating, reduces anxiety and stress, and promotes sleep.
Winner of multiple cannabis cups. Strain of the year 2019 by Leafly.
GMO Cookies/ Chem Cookies / GMO
Indica/Sativa: 90% indica, 10% sativa
THC: 26-30%
Cross: Chemdawg and GSC (Girl Scout Cookies).
Flavour: Pungent, earthy, and chemical.
Effects: Relaxation, euphoria, and relief from stress and pain.
Several awards including Best Indica at the Midwest Cannabis Cup.
Sativa
Durban Poison
THC: 24-30%
Cross: Landrace strain from Durban, South Africa
Flavour: Sweet, earthy, and pine.
Effects: Energizing, uplifting and focus-enhancing. Ideal for daytime use and creative activities.
Known for its purity and consistent high THC content.
Super Silver Haze
THC: 25-31%
Cross: Skunk, Northern Lights, and Haze.
Flavour: Citrus, earthy and sweet.
Effects: Euphoric, creative and energetic. Great for boosting mood and productivity.
High Times Cannabis Cup winner in 1997, 1998, and 1999.
Sour Diesel
THC: 20-25%
Cross: Chemdawg and Super Skunk.
Flavour: Diesel, pungent and earthy.
Effects: Fast acting, uplifting, cerebral and energizing. Helps with stress and low mood.
Frequently listed among the “best of” lists from various cannabis publications.
Hybrid
Permanent Marker
Indica/Sativa: 60% indica, 40% sativa
THC: 24-30%
Cross: Biscotti and Jealousy.
Flavour: Sweet, earthy, and pungent.
Effects: Tingly, talkative, and aroused.
Leafly Strain of the Year 2023
Runtz
Indica/Sativa: 50% indica, 50% sativa
THC: 24-29%
Cross: Zkittlez and Gelato.
Flavour: Sweet, fruity, and creamy.
Effects: Uplifting, happy, and relaxing.
Leafly Strain of the Year 2020. A favourite among both recreational and medical users
Bruce Banner
Indica/Sativa: 60% sativa, 40% indica
THC: 23-29%
Cross: OG Kush and Strawberry Diesel.
Flavour: Sweet, diesel, and earthy.
Effects: Euphoria, creativity, uplifting and stress relief.
Multiple Cannabis Cups winner, including High Times Cannabis Cup.
By now, you should have a basic understanding of THC, its effects, and its implications. When choosing a high-THC cannabis product, there are several factors to consider, such as the product category (flower, oil, edible..), the strain type (Indica, Sativa, Hybrid), and the THC levels. Additionally, consider how you will consume the product: will you be smoking, vaporizing or ingesting it? As you navigate the world of high-THC strains in Canada, remember to consider both the benefits and potential risks. If you aren’t an advanced cannabis user, start with small steps and prioritise safety. Seek guidance from your doctor or a local cannabis expert where applicable.
© Kanab Inc. – Kanab Inc. is a Toronto based cannabis retail company that honors the historical significance and uses of the cannabis plant across cultures and civilizations. Kanab has now opened its first cannabis dispensary at the intersection of Don Mills Road and York Mills Road in North York region of Toronto, Ontario (South of 401, West of 404 / Don Valley Parkway, and East of Leslie). For more info, please visit: kanab.ca
