Determining the strength of cannabis is not always straight forward, once you have have chosen which strain you would like to use, there are also a number of factors which will affect the THC content of the bud.

The main external factors influencing the strength of your bud are: Location (e.g. indoor vs outdoor), growing medium (e.g. soil or hydroponics), nutrient levels, light source, temperature & humidity and carbon dioxide levels.

Although there are many methods of growing cannabis, they all come with a different set of pros and cons ... for example, if you wanted to grow your plant under some of the UVB spectrum, you would either have to find a nice mountain close to the equator or purchase some UVB emitting LEDs. Both of these methods have problems; LED lights are rather expensive, and walking up a mountain to grow your bud will also leave you feeling pretty low on energy.

Genetics also affect the strength of the plant. Genetics are what holds all the information about the plant. How much THC and CBD it produces, how it smells and tastes and how it grows. Cannabis displays a mix of traits from their parent strains just like humans. 

Stable genetics produce predictable features passed down from parent strains, whereas unstable genetics can often give the offspring unpredictable features which can be difficult to manage.

Nowadays, cultivators are able to select desired characteristics of growth, appearance and effect. This can be really useful in finding a strain that's right for you and your needs.

That being said, it’s important to take all these factors into consideration when you begin your garden so that you know what kind of strain is most suitable for you. Landrace and heirloom seeds for example, have been cultivated for centuries and have traits specific to adapting to their native environment. On the other hand, when growing indoors you may want to find a strain that is less pungent, smaller in size and more pest resilient. It is for this reason that you should have a good idea about how you intend to grow your garden before you chose your seeds.

So now we’ve got that out the way, what are the best and strongest strains out there?


A top-shelf strain created from an extremely vigorous breeding program combining some of California’s most potent cookie strains. Royal Cookies is well suited to outdoor and indoor environments, however they do require a warm climate to thrive in the open. Royal Cookies produces a sweet and earthy aroma and an effect that uplifts the mind and gently relaxes the body, with a THC content of 23% it’s hardly surprising it’s one of our favourites!

• THC: 23%Royal Cookies
• CBD: Low
• Yield Indoor: 450-525g/m²
• Yield Outdoor: 450-500 grams per plant dried
• Height Indoor: 80-110cm
• Height Outdoor: 140-180cm
• Flowering time: 8-9 weeks
• Harvest month: Middle of October
• Genetic Background: Cookies Forum x Cookies Forum
• Type: 20% Sativa - 80% Indica
• Effect: Relaxed and Euphoric


After haze genetics came to the Netherlands, several hybrids were made. Later the seeds were combined with a male derived from old school Haze plants. The result is Amnesia Haze, like the name suggests, a truly psychedelic head high which can allow the user to turn off their brain completely after a session. It has a fresh and fruity flavour

• THC: 22%
Amnesia Haze• CBD: Medium
• Yield Indoor: 600-650g/m²
• Yield Outdoor: 650-700 grams per plant dried
• Height Indoor: 80-140cm
• Height Outdoor: 175-210cm
• Flowering time: 10-11 Weeks
• Harvest month: Late October
• Genetic Background: Original Amnesia Haze
• Type: 70% Sativa - 30% Indica
• Effect: Extremely high, long-lasting, body relaxing


The 2008 High Times Cannabis Cup winner, Lemon haze is a hybrid of Lemon Skunk and Amnesia Haze. Both are Sativas which feature a prominent and uniue flavour. Boasting a strong, sour citrus flavour, this strain has a high concentration of Limonene which is supposed to offer a strong fragrance, perfect for vaping or smoking. Lemon Haze is a sativa-dominant strain which comes with all the uplifting effects that you would expect, increased energy levels, creativity and motivation, giving way to a more relaxed body high as time passes, for this reason it is not recommended to use before bed as it may prevent sleep. Lemon Haze flowers within 8-9 weeks, depending on grow conditions. Flowering is expected in mid-October for outdoor grows. Yields are upwards of 150g per plant for indoor grows, 450-500g for outdoor grows. Each plant reaches between 80 and 140 centimeters indoors, and 130 to 170 centimeters when grown outdoors.

• THC: 21%Lemon Haze cannabis
• CBD: Low
• Yield Indoor: 425-475g/m²
• Yield Outdoor: 450-500 grams per plant dried
• Height Indoor: 80-140cm
• Height Outdoor: 130-170cm
• Flowering time: 8-9 weeks
• Harvest month: Middle of October
• Genetic Background: Lemon Skunk x Amnesia Haze
• Type: 75% Sativa - 25% Indica
• Effect: A combination of stoned + high


A hybrid of Sativa and Indica, Moby Dick is one of the strongest Sativas out there. Royal Moby is a cross between White Widow and Haze. Usually one trait is more prominent than another, which is referred to as the dominant trait. This is a sativa-dominant plant that delivers a charged buzz. Royal Moby is known to be a pure psychedelic experience, being among the strongest THC-bearing plants. Being a sativa-dominant plant, Royal Moby is capable of growing big and strong during the flowering period, with long stretchy branches and buds all over. Indoors it can reach 1.4 meters and outdoors in the sun it can grow to over 3 metres tall. The strain is also favoured for its short flowering period (a trait of Indica plants) and resistance to mould. Because of its great size, Royal Moby requires a little extra time and attention, but it is a perfect sacrifice for a better smoke.

• THC: 21%
• CBD: LowRoyal Moby
• Yield Indoor: 550-600g/m²
• Yield Outdoor: 650-700 grams per plant dried
• Height Indoor: 80-140cm
• Height Outdoor: 200-300cm
• Flowering time: 9-10 weeks
• Harvest month: Late October
• Genetic Background: Haze x White Widow
• Type: 65% Sativa - 35% Indica
• Effect: A combination of stoned + high


After years of breeding thousands of seeds from Colombia, Mexico, Thailand and South India, a pair of breeders set about discovering a hybrid that could capture the sweet taste and high of the Haze strain with the short flowering period of an indica. Using a combination of Haze and Northern Lights genetics, the result is a classic – Shining Silver Haze. This strain offers an instant sweet taste with an instant head high that will put your brain into an actual haze of thoughts. It gets its name from the massive amount of shiny crystals that cover the bud.

• THC: 21%Shining Silver Haze
• CBD: Medium
• Yield Indoor: 600-650g/m²
• Yield Outdoor: 600-650 grams per plant dried
• Height Indoor: 80-120cm
• Height Outdoor: 180-220cm
• Flowering time: 9-11 weeks
• Harvest month: Late October
• Genetic Background: Haze x (Skunk x Northern Light)
• Type: 75% Sativa - 25% Indica
• Effect: Very high



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