Biggest Weed Plants in the world – Cannabis

A weed is a plant that is considered undesirable in a specific situation. The term weed has no botanical significance because a plant that is weed in one condition is not a weed when grown in a situation where it is wanted.

There are many farmhouses of weed plants worldwide and they help in earning money annually. Many species of weed plants grow very tall, for example, Cannabis is considered one of the biggest weed plant in the world.

Many weed plants including Cannabis are considered very beneficial both in economic and health aspects.

Cannabis plant is also called as hemp, the term hemp is only used for non-drug purpose.

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What is the Biggest Weed Plant in the World?

Currently biggest weed plant found is Thistle. Thistle is a common name of flowering plant having leaves with sharp prickles on the margins mostly in the plant family of Asteraceae. Thistle plants are also very beneficial for pollinators.

Interesting Facts about Thistle

Thistle is national flower of Scotland; and most recognizable symbol. Thistle is considered as bold and beautiful flower. But its name is not in Guinness book of world record, and there is a danger that this flower may extinct until its name comes in Guinness book of world record.


Cannabis is also considered as the tallest weed plant according to farmers as size of cannabis can grow up to 15 feet tall every year if it is properly looked after.

Cannabis is economically very beneficial and provides huge amount of money every year. Cannabis tree can yield up to 5 pounds (2.2kg) every year if taken well care of. Every farmer tries its best to get benefits economically.

Benefits of Weed Plants;

There are multiple benefits of weed plants if you have proper knowledge and guidance about it, but unfortunately many gardeners do not know the importance of these plants and they just bump them off from their garden because weed is a plant considered undesirable ‘ a plant in the wrong place’. They are grown in farm fields, gardens, parks etc.

Biggest weed plants in the world?
Biggest weed plants in the world?

Some important benefits of weed plants are listed below:

Adds Nutrients to Soil

Some weeds produce carbon in the soil and provide nutrients to the soil. Weeds increase nutrient level in the soil. Red clover weed has the ability to fix nitrogen levels in the soil. Weeds act as green fertilizer and add organic matter to the soil.

Prevents Soil Erosion;

Weeds cover bare soil and prevent soil erosion during rainy season in summer. Leaves of weed plant stop rainfall falling on the soil and prevents soil erosion. Weeds that grow on sand and waste land save the environment by fulfilling its water requirement.

Weeds are Used As Fodder for Animals

Many weeds are used as fodder for animals as weeds are a rich source of nutrients. The category of weeds used as fodders are Convolvulus Arvensis. Some weeds have good taste and animals eat them zealously.

Use as Vegetables

Some weeds are edible and are good source of energy and nutrients e.g. Dandelion, sheep sorrel, Chickweed etc. Chickweed is a great source of vitamins A, D and C as well as iron, calcium, potassium and zinc. Chickweed has very good flavor like spinach.

Dandelion also contains vitamins A, B, C, D as well as minerals such as iron, potassium and zinc. Sheep sorrel is used to treat inflammation, diarrhea and even scurvy as it contains vitamin C and E.

Use in Medicine

In ancient times weeds were extracted to use as medicines. In present time weeds are still used as medicine.

Following are the weeds that are medically very important and are used to treat different diseases:


Dandelion holds significant medical value. Dandelions have a history of treating liver problems and kidney disease and these are also useful for treating heart burn, appendicitis, and appetite stimulant.

Plantin leaves;

You can eat Plantin leaves cooked or raw, but you must prefer younger leaves as they are good in taste while old leaves do not taste well. Just like carrot plantin leaves contain high amounts of Vitamin A and it is high in riboflavin and vitamin B1.

Plantin leaves are medically very important as they are used to treat Bronchitis, sore throats, cold symptoms and reduce pain and discomfort.


Stinging nettles can be used to treat urination problems, kidney stones, and allergies as nettles are a rich source of vitamins A, B2, C, D and K.

Use as Fuel:

Weed plants are also used as fire wood e.g. Prosopis juliflora it is a tree weed.

Use in Making Mats and Screens:

Weed stems of some plants are used in making Mats and screens e.g. Cyperus pangorei species of Sedge. This weed plant is used in making high quality mats. It is used as a source of material for weaving.

THC (Tetrahydrocannabinol) Percentage in Weeds

By dry weight percentage of THC in weeds is estimated as 35%.  There are no weeds plants having THC percentage more than 35%.

Best Indoor Weed Plant

The best indoor weed plant is Super Silver Haze also called Super Lemon Haze. Yield of this weed plant is very high with a range from anywhere between 600 and 800 grams per square meter per plant. The THC content ranges from 15 to 20%.

Best Outdoor Weed Plant

Weed plant that can bear environmental stress and severity are best outdoor plants. The best outdoor weed plant is Blue Dream. Blue dream plants grow tall can hit the 4 to 6 foot mark. It is easy to grow blue dream and it yields well.

FAQs : Biggest Weed Plants in the World

What is biggest weed plant in the world?

The biggest of all wee plants in the world ever found is thistle plant. It’s in Orangburg Country. The plant is literally 11 feet and 6 inches tall and is seen in the backyard of Rick Streeter on Neeses Highway.

How big should my weed plant be in 2 weeks?

After a period of 2 weeks, your weed plant must be 2 to 3 inches tall with 2 to 3 sets of leaves at minimum. If your plant is not that much tall or doesn’t have that much leaves, it is not growing well.

How tall can the largest weed grow?

If we talk about Can of Sativa, it can grow up to 20 feet. But it is observed that the grown of Sativa is too slow and can reach harvest only if it grows enough. Anyhow, there’re two more plants that can grow taller. Indica is a bushy plant that can go upto 3 to 6 feet.


Weed plants are very significant both economically and medically. They are used to treat various diseases. Some weed plants are economically very important as they are a source to get large yield and a source of heavy income if farmers handle them carefully.

Saad Iqbal is a professional civil engineering and freelance write. He's passionate about structures, construction management, and home improvement topics. He's been working as a Senior Engineer in a consultant firm for over 8 years. Besides he loves writing informative and in-depth content focused on construction and home-related topics. You can catch him at his linkedin page or reach out via our contact us page.

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