Marijuana Strains with The Most THC

High THC Marijuana strains have been getting more and more potent over the past several decades, and we have some excellent strains to show for it. Growing techniques that maximize THC levels have also been improving. 

Why not get in on the action and grow some super potent weed of your own? Here are some of the highest THC strains you can grow today.

High THC Is What We Love

THC can affect on your brain, memory, and coordination. It does this by attaching to and activating your body’s cannabinoid receptors, which everyone has.

This causes the high feeling.The most THC is found in marijuana plants’ buds. That’s why growers aim to maximize the quantity, size, and stickiness of their plants’ buds. This stickiness comes from the resin that is produced on the buds of marijuana plants, also high in THC.

Here are some amazing seed deals. Buy 10 and get 10 seeds for free!

How to Grow Marijuana with the Most THC

While picking the right strain is important, there are also many grow techniques and external factors that will determine how potent your plants will end up being. Your decisions as a grower can make a huge difference.

Choosing the right location (indoors or outdoors) is a good place to start. You have more control over the environmental factors when growing indoors, but it also takes more money and effort.

Whether you’re growing indoors or outdoors, optimize the environment (i.e. temperature and humidity levels) and lighting. If everything is optimal, your plants will reward you with tons of THC.

High THC Strains

Genetics also play a role in growing strong weed. So start with high-quality seeds and choose the best strains. Here are some marijuana strains with the highest THC levels.

Blue Dream Strain

Blue Dream marijuana Strain
THC level 21%
Flowering Time9 – 10 weeks indoors, October outdoors.
Yields21 oz per 3x3ft

Blue Dream is one of the highest THC strains. It, like the other strains listed in this article, has a THC level of approximately 21%, which is extremely high. Blue Dream is a hybrid strain, meaning a combination of sativa and indica strains (although it is heavier in sativa genes).

This strain of marijuana is well known for its body high (which is mostly mild) that also leads to a more creative way of thinking. It is extremely popular and is one of the most sought after strains of weed, perhaps also because of its superior flavor: you can expect it to have a fruit taste and smell, and a euphoric feeling when you’re smoking it.

Blue Dream also has medicinal value: it works particularly well to relieve headaches, calm anxiety, and ease depression and its symptoms.

When I want an easy grow that leads to an extra chill vibe, I always sprinkle some Blue Dream seeds into my soil!


It is said that Blue Dream is the most popular strain of marijuana to be grown in the United States, and it’s for good reason. Blue Dream marijuana plants are, in addition to being one of the high THC strains, one of the easiest strains to grow altogether.

Its yield is always quite good, even if you don’t have an expensive setup and invest lots of money into your growing operation.

Girl Scout Cookies Strain

Girl Scout Cookies pot Strain
THC Level21%
Flowering Time9 – 10 weeks indoors, mid-October outdoors.
Yields21 oz per 3x3ft

Much like actual Girl Scout Cookies, the Girl Scout Cookies marijuana strain is a huge hit. It is one of the highest THC strains, at about 21% THC, and is a popular favorite among smokers of marijuana. Its taste is best characterized as earthy and sweet. The high you feel when you smoke Girl Scout Cookies will likely be relaxed, but not in a depressed way: you’ll have a feeling of euphoria like you’d never believe.

Besides these effects from smoking Girl Scout Cookies, there’s also a medicinal value. It can ease pain as well as feelings of nausea, and stimulate the appetite.

Girl Scout Cookies have actually won a number of awards. Some strains are crossbred with White Widow XTRM to achieve buds that are as dense as possible. Girl Scout Cookies is also a hybrid strain, although its genetics are around 20% sativa, 80% indica.

You can’t go wrong with Girl Scout Cookies, it’s an absolute classic and never fails to impress me!


Gold Leaf Strain

Gold Leaf cannabis Strain
THC Level21%
Flowering Time9 weeks indoors, early October outdoors.
Yields16 to 23 oz per 3x3ft

Gold Leaf is an indica based hybrid strain. This marijuana strain has among the highest THC levels at 21%. Its high is both euphoric and relaxing and is known for smoking very smoothly.

It serves as an excellent tool for falling asleep easier at night, due in part to the fact that it is often used for people suffering from anxiety, stress, and other related issues. The plant itself looks distinct in that it has huge colas and grows to very tall heights.

This plant is also high in CBD, which makes it an excellent strain for medicinal uses. It has an extremely high yield, on average, and is best grown in a sunny climate similar to what you might find in the Mediterranean.

Cultivated by yours truly, Gold Leaf has a special place in my heart. If you’re looking for big yields this may be the strain for you!


Amnesia Haze Strain

Amnesia Haze marijuana Strain
THC Level21%
Flowering Time9 weeks indoors, late October outdoors.
Yields21 to 25 oz per 3x3ft

Amnesia Haze is a sativa dominant strain that, in contrast to the Gold Leaf strain, grows only to a medium height. Its flavor is quite strong and is usually a sweet or spicy (or both) type of taste.

The high you get from smoking an Amnesia Haze bud is mostly head-focused, mellowing out the user less than a quarter of an hour after smoking. The thing about Amnesia Haze is that, although its effect is strongly social and uplifting, this feeling wears off rather quickly. For certain people, this can be a big asset.

Amnesia Haze plants have dark lime green colored buds, which are known for their crystal coating. The plants look really healthy, with full calyxes, crystals, and hairs that are generally a red-orange color.

Plenty of breeders actually prefer to breed strains that are crossbred with Amnesia Haze, or otherwise based off of this strain.

Amnesia Haze works well medically, even though it has high THC. It’s often used for migraines, nausea, and even fear and depression. People with symptoms of anxiety, ADD or ADHD, PMS, or even Fibromyalgia prefer Amnesia Haze to relieve or control their symptoms.

Talk about living up to its name, Amnesia Haze will make you forget your worries and enjoy the moment!


Harvesting Tips for the Highest THC Cannabis Strains

One of the most important parts of maximizing the THC of your buds is to harvest them at the right time. Timing is everything here; harvest too early, and you’ll be missing out on extra potency. Harvest too late, and the THC will have started to degrade.

Watch your plants carefully during this end stage. Watch the trichomes; when they start turning amber in color, you know it’s almost time to harvest.

Download my free marijuana grow guide and start growing High THC strains

Once again, for the best results, you need to start with the best seeds! Shop my store for high-quality marijuana seeds.

Happy growing!


FAQ On High THC Strains

What is the difference between THC and CBD?

THC, also known as tetrahydrocannabinol, is the well-known chemical in marijuana that has psychoactive effects. CBD, or cannabidiol, is often higher in medical marijuana. It does not have psychoactive effects, so users can use marijuana high in CBD without getting high, as long as the THC levels are low.

Do high THC strains last longer than regular strains?

Yes; the higher the amount of THC you consume, the longer it takes your body to process. In other words, you stay high for longer.

What level of THC is considered high?

THC levels above 20% are generally considered to be high by most people.

Avatar for Robert Bergman

Mr Robert Bergman PhD


Robert Bergman is an Amsterdam-based marijuana grow expert who has years of experience from small grows to massive operations ... See profile

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3 comments on “Marijuana Strains with The Most THC”

  1. Blue Dream Xtrm is the strongest, best tasting, most outstanding plant that I grew out of many Strains. The stems smell fruity even in the beginning vegetative stage, it smells the best out of any Strain. The High is instant powerful head stoned, pure euphoric, mellow, spacey head and body relaxation. It makes all my arthritis pain go away, good for PTSD and depression, and the best smoke to get Stoned from. Longest shelf life buds; stickiness, potency, smell, and taste never go away, long as you store in glass containers. Ordered a lifetime set of Blue Dream Xtrm seeds, this is all I will grow 🙂

  2. […] since it alleviates the symptoms so well. These symptoms often include nausea, for example. A strain of marijuana that is high in THC can do wonders to help nausea and stimulate appetite. Another symptom often found in late stage […]