Top 5 tallest cannabis strains from seeds

To many cannabis growers tall, heavy yielding cannabis plants are the ultimate types of cannabis plants. They can be breathtakingly impressive to see, with true XXL yields but they may take some effort and time to grow. An outdoor 4m tall monster can be hard to hide from your neighbours, but if you have the space, know-how and the right cannabis seeds then there is something quite remarkable about seeing a truly giant cannabis plant take shape.

Average height of feminised vs autoflowering cannabis

The tallest cannabis plants can take many months to reach full size. This means you may need a mild climate with a long growing season. The longer life cycle of plants grown from photoperiod feminised cannabis seeds tends to suit those growers wanting to grow the tallest and biggest plants possible.

Depending on the cannabis genetics, your plants may reach 2-3m tall or more. Often those growing the tallest plants tend to be outdoor growers with private grow locations. Indoor growers often tend to have height restrictions from their indoor grow tents and tend to use grow techniques (SCROG, Supercropping, topping etc) to manage and restrict vertical growth.

Plants grown from autoflower seeds tend to be shorter, bushier and more compact than those grown photoperiod feminised seeds. Typically, autoflower plants reach around a metre tall, outdoors some may be able to reach nearer 1.5m. However, autoflowers in general are shorter, stockier and more compact than photoperiod strains.

Note that most autoflower strains grow from seed to harvest in around 10-11 weeks (maybe a couple of weeks longer outdoors). Given the short autoflower life cycle, it simply isn't realistic to expect them to reach the same sizes as the tallest photoperiod cannabis strains.

Tallest Dutch Passion cannabis strains

This selection of the tallest cannabis strains are all photoperiod feminised cannabis seeds. For the tallest plants you may wish to consider a few additional tips which may allow you a fully optimised approach:

•    Starting your plants indoors with a couple of weeks/months of pre-growth allows your plants a head-start before they are put outdoors. Use of quality LED light is the best way to encourage a healthy, vigorous start.

•    Ensure a grow location which allows an extensive root network to form. Moist, good quality soil is essential. If local soil quality is poor supplement with supermarket/grow-shop soil and fertilisers. Slow-release organic nutrients such as BioTabs are recommended for a steady release of essential nutrients throughout the grow.

•    Select a location with ample direct sunshine throughout the day. If possible, some shelter from the prevailing wind may help, as will a nearby water source in the event that severe drought necessitates manual watering. The following UK outdoor grow guide offers some useful tips for outdoor growers in the UK and elsewhere.

•    A grow location that allows an easy start to your season and a late finish will support the long grow cycles necessary to grow the tallest cannabis strains. For those with short growing seasons but ambitions to grow the biggest strains a tall greenhouse is a great way to extend the growing season. This protects your plants from the worst of the early/late season weather allowing them to complete a long grow cycle in optimised conditions.

Passion #1: 3 - 4m tall outdoor plants are the rule rather than the exception!

Passion #1 is one of Dutch Passion’s most reliable outdoor best sellers and has been for a couple of decades. These are hybrid cannabis seeds, they grow tall and fast. Select a grow location with ample direct sunlight and quality soil for a large root mass and you can expect plants around 4m tall.

THC levels are up to 20%, these powerful Californian genetics were found in the 1970’s and do well in greenhouses or outdoors. In the Northern Hemisphere she can be ready to harvest as early as late September. Passion #1 is a best selling member of the acclaimed Dutch Outdoor cannabis seed collection.

Passion #1® Californian Indica
	Feminised		Outdoor
	Dutch Outdoor		7-9 weeks
	Hybrid		XL
	Very high		Cup winner

Order Now

Passion #1® Californian Indica
	Feminised		Outdoor
	Dutch Outdoor		7-9 weeks
	Hybrid		XL
	Very high		Cup winner

Order Now

Passion #1® Californian Indica
	Feminised		Outdoor
	Dutch Outdoor		7-9 weeks
	Hybrid		XL
	Very high		Cup winner

Order Now

Desfrán: Can reach 4m+ outdoors in optimum conditions

Desfrán is perhaps the stretchiest of all Dutch Passion’s cannabis strains. She is a pure jungle sativa using genetics from the famous ‘Destroyer’ strain.

Desfrán can comfortably triple her height in bloom. In warm, sunny conditions with a long growing season you can expect plants to exceed 4m and be almost as wide. Yields are very heavy and potency is genuinely excellent. Indoor growers find she is an excellent strain to scrog.

Outdoor growers who can keep Desfrán in optimised health from feminised cannabis seed to harvest can expect exceptional quality sativa buds with a soaring, psychedelic high.

Note: Desfrán is such a tall strain that she can be seen from quite some distance, especially in urban settings. If vertical growth gets out of control, whether growing indoors or outdoors, then super cropping the taller branches is a good way to maintain a shorter plant stature.

Desfrán® Destroyer X Destroyer
	Feminised		Indoor
	Latin America		9 weeks
	Sativa		XXL
	Very high		Cup winner

Order Now

Desfrán® Destroyer X Destroyer
	Feminised		Indoor
	Latin America		9 weeks
	Sativa		XXL
	Very high		Cup winner

Order Now

Desfrán® Destroyer X Destroyer
	Feminised		Indoor
	Latin America		9 weeks
	Sativa		XXL
	Very high		Cup winner

Order Now

C-Vibez: Can exceed 3m in good outdoor conditions

If you’re looking to grow a tall cannabis strain and want some absolutely banging potency levels, then C-Vibez comes with our highest recommendations. THC levels of 20-25% are the rule rather than the exception on this sativa dominant strain. This is one of Dutch Passion premier high THC strains and she can exceed 3m in good outdoor conditions with heavy side branching and subsequently very heavy harvests. She is almost as wide as she is tall at harvest.

In recent lab tests every C-Vibez plant returned THC levels of 20-25%, this indicates superb potency comes as standard. The following C-Vibez grow review was made from an indoor grow but is recommended reading to see the size of the plants and the weight of the harvest. A member of the ‘Classics cannabis seed collection’, home to some of the most reliable and best loved strain in the Dutch Passion collection.

C-Vibez® Mad Scientist X Voodoo
	Feminised		Indoor
	Classics		10-12 weeks
	Hybrid		XXL
	Extremely high

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C-Vibez® Mad Scientist X Voodoo
	Feminised		Indoor
	Classics		10-12 weeks
	Hybrid		XXL
	Extremely high

Order Now

C-Vibez® Mad Scientist X Voodoo
	Feminised		Indoor
	Classics		10-12 weeks
	Hybrid		XXL
	Extremely high

Order Now

Amsterdam Amnesia: THC rich plants can approach 4m tall

Amnesia strains use professional grade sativa genetics to deliver notoriously powerful and potent effects. Amsterdam Amnesia delivers this with plants that can reach around 3-4m tall in good outdoor conditions. Yields on the largest plants are indeed exceptionally heavy and can comfortably exceed 1Kg per plant when grown well.

If growing this outdoors, ensure some good quality, nutrient-rich soil and water frequently in mid-summer to allow her to reach her full genetic potential. If you plan to grow an Amnesia this year, remember that the best Amnesia strains always come from Amsterdam!

Note: If you are trying to grow tall cannabis strains indoors and struggling for space then you may wish to consider using a grow technique such as the SCROG method (Screen Of Green). Some growers also implement the SCROG method when growing tall strains outdoors. This will allow you to manage the growth more effectively with less vertical stretch.

Amsterdam Amnesia® Amsterdam Amnesia
	Feminised		Indoor
	Classics		9-11 weeks
	Sativa		XXL
	Very high

Order Now

Amsterdam Amnesia® Amsterdam Amnesia
	Feminised		Indoor
	Classics		9-11 weeks
	Sativa		XXL
	Very high

Order Now

Amsterdam Amnesia® Amsterdam Amnesia
	Feminised		Indoor
	Classics		9-11 weeks
	Sativa		XXL
	Very high

Order Now

Durban Poison: Expect 3m+ plants with heavy yields and superb effects

Durban Poison is a legendary South African sativa strain which can be grown indoors or outdoors with high-end results and heavy yields. This is a strain with a stellar reputation for all the right reasons. The sativa dominant plants grow quickly and are well adapted to outdoor conditions.

Repeat growers, of which there are literally thousands, adore the stress-busting effects and the blissfully pleasurable feel-good high. Durban Poison is still one of the more popular strains available in dispensaries and coffee shops. Get your grow conditions optimised and you can be admiring a 3m+ tall outdoor monster this summer!

Note: When growing indoors/outdoors the tallest part of the plant is usually the tip of the main central bloom. If this is cut off (indoors or outdoors) it is known as ‘topping’ and produces a shorter, bushier plant. If you find that your Durban Poison is getting a tiny bit too large for your liking, then this technique is recommended.

Durban Poison® Durban X Unknown Indica
	Feminised		Indoor/Outdoor
	Dutch Outdoor		8 weeks
	Sativa		XXL
	High

Order Now

Durban Poison® Durban X Unknown Indica
	Feminised		Indoor/Outdoor
	Dutch Outdoor		8 weeks
	Sativa		XXL
	High

Order Now

Durban Poison® Durban X Unknown Indica
	Feminised		Indoor/Outdoor
	Dutch Outdoor		8 weeks
	Sativa		XXL
	High

Order Now

Other tips for growing cannabis strains with extreme height

Growing tall cannabis strains isn't that difficult if you start with the right cannabis seeds. Often, but not always, it’s the sativa (or sativa dominant) strains which can stretch a little more than the others and produce towering plants.

To grow the tallest plants, remember to offer unrestricted root space and good quality soil which you can enrich with suitable levels of fertiliser, soil improvers and/or slow-release nutrients if required. Growing plants in containers tends to limit the final plant size. For that reason, those that grow the largest plants often prefer to root their plants directly into well-prepared ground.

If growing in a greenhouse you may also wish to provide supplemental artificial lighting to ensure maximised growth rates even on cloudy days. Very few indoor growers have the space to grow a 4m tall monster, but if you do have a large indoor warehouse to grow tall plants in you will need ample lighting.

Those that specialise in growing the tallest/largest plants work hard to ensure optimised conditions from cannabis seed through to harvest. They also often have a long (outdoor) growing season that allows their plants to be harvested in late October/early November in the Northern Hemisphere (Late April/early May in Southern Hemisphere). The long growing season can be enhanced by a month or two of indoor pre-growth on your plants before they are placed outdoors.

Much of your future success will depend on the choice of cannabis seeds. If you’re not sure which cannabis seeds best suit you then please check out the Dutch Passion Seed Finder. This asks you a few simple questions about your grow, your grow conditions (or outdoor climate) and the aims of your grow. You may be shooting for maximum yield, extreme potency or perhaps the quickest possible harvest. Whatever your goal, the Seed Finder will recommend the best cannabis seeds to get you there. Good luck and enjoy your next grow!