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The Five Shortest Autoflower Strains - A Fast Buds Guide

Value stealth? No space? We reveal the five shortest strains of autoflowering cannabis seeds.
15 January 2021
7 min read
The Five Shortest Autoflower Strains - A Fast Buds Guide

  • 1. Green crack auto 24-35 inches
  • 1. a. Grow tips
  • 2. Grapefruit auto 31-47 inches
  • 2. a. Grow tips
  • 3. Cbd crack auto 31-43 inches
  • 3. a. Grow tips
  • 4. Fastberry auto 24-43 inches
  • 4. a. Grow tips
  • 5. Rhino ryder 23-43 inches
  • 5. a. Grow tips
  • 6. In conclusion

Bigger is not always better. A supersized Sativa may look great in photos, but what do you do when it starts to outgrow its tent? Get a bigger tent? Well, then how do you discreetly place that in your home? Nobody wants law enforcement banging their door down because their pot plant was too big to hide.

If you value stealthiness or have limited space, autoflowering cannabis seeds grow compact and shorter, and can still provide you with big yields and potent flowers. Instead of growing like trees, these strains grow like squat bushes packed with dense buds. Sometimes referred to as dwarf cannabis, modern autoflowers offer staggering yields and award-winning, high-THC buds within 10-weeks of planting. With that in mind, let's kick off our list at number 5 strains!

For each strain, we've included a link to a grow report/grow diary that illustrates one way (of many) to successfully grow each variety. Check out our grow tips.

5. Green Crack Auto 24-35 inches 

Who wants to get hyped! No strain provides a rush like Green Crack (sometimes called Green Crush). The original version of this legendary strain comes in both Sativa-dominant and Indica-dominant varieties. Fast Buds' Autoflowering version is an almost perfect 50/50 hybrid that gives the rush of a Sativa, while the Indica relaxation eliminates paranoia and nervousness.


Five shortest autoflower strains: green crack auto

Green Crack Auto by Bongkhan.

Topping out at 35 inches, or 90 centimeters, The small bushy Green Crack still offers massive yields, as you can see from the picture above. Green Crack offers a smooth, balanced experience, and fits nicely in a closet or any kind of stealth grow box.

Green Crack Auto
5 out of 5
nice fast delivery, took 3 days to germinate! have seeds 9 days into germination and they are still going.... so good job. will be ordering more!
Verified customer
Reviewed 13 March 2018

“... the taste was of green […] mango and after it cured for 3 weeks […] the fragrance turned to ripe [...] mango [...] It would first make you talk out, then euphoric and then totally relaxed...”


This strain produces light-green buds with a long, dense, and pointy appearance while being completely buried in a thick layer of resin that gives them that beautiful sticky aspect.

Grow Tips

  • Due to growing homogeneously, it’s ideal to maximize your grow space by cultivating in a SOG.
  • Doesn’t matter if it’s indoors or outdoors, this plant likes a lot of nutrients so make sure you feed her properly.
  • Remember to tie down the branches or perform other LST techniques to make sure the buds get enough light and fatten up properly.

4. Grapefruit Auto 31-47 inches

Bred with indoor stealth grows in mind, Grapefruit is dorm-room closet ganja par excellence. Reaching a modest 31-47 inches, or 120 centimeters, this strain offers a fruity, limonene-rich aroma, unlike any strain you've tried before.


Five shortest autoflower strains: grapefruit auto

Grapefruit Auto by disarie.

The well-balanced high pairs perfectly with its easy-to-hide dwarf structure. If you're short on space and can only grow one strain at a time, Grapefruit is the perfect jack-of-all-trades.

Grapefruit Auto
5 out of 5
My grapefruit yielded well, considering I'm a newbie. The nugs are super frosty and sticky. A very fruity and enjoyable smoke
Verified customer
Reviewed 27 October 2020

“...Drinks and eats very well [...] Last week its branches were going to break up after ripening because of their weight [...] Smells like strawberry with some earthy aroma...”

You can expect extremely dense and long buds with dark and light-green hues, and a lot of orange hairs that give the flowers the perfect bag appeal while looking like they’ve been dipped in sugar.

Grow Tips

  • A great choice for outdoor growers who are looking for a fast-flowering plant that can be grown in humid and colder climates.
  • Easy to grow and requires little maintenance, ideal for beginners experimenting with autos.
  • One of the best for those growing on a balcony or terrace.

Related story
What is CBD?

3. CBD Crack Auto 31-43 inches

CBD Crack is Green Crack's small and more serious cousin. Sporting a 1:1 CBD to THC-ratio, this cannabadiol-rich strain not only grows short, it's Fast Buds' most versatile strain. If high-THC weed (especially Sativas) makes you nervous or paranoid, this strain's 1:1 CBD to THC offers a smooth, euphoric alternative. 


Five shortest autoflower strains: cbd crack auto

CBD Crack Auto by Djesus.

CBD regulates the receptors in the brain that THC triggers (CB1 and CB2 for the nerds among us), preventing run-away anxiety from taking hold and allowing even the most cannabis averse to enjoy a euphoric buzz that won't leave you couch-locked, speedy, or nervous. This doesn't even begin to address the other marvelous things CBD has to offer.

CBD Auto 11 CBD Crack
4 out of 5
I didn't get the biggest yield, but that was due to my beginner errors, but the buds are still very dense and the flowers are sticky!
Verified customer
Reviewed 2 April 2020

“...she relaxes me and it tastes really delicious in the mouth. I recommend this genetics to all patients or to those who wish to spend a good moment of relaxation in front of the TV...”

This strain grows flowers with a chunky appearance and bright orange hairs that wrap around the super frosty calyxes and complement their aspect beautifully. 

Grow Tips

  • It’s recommended to tie down the branches of prune lightly to allow light to reach the lower branches, increasing yields.
  • Make sure you provide support to all the branches to prevent them from snapping due to the density of the buds.
  • Remember to wait for the trichomes to turn amber if you want a more medicinal effect.

2. Fastberry Auto 24-43 inches

If there were a cannabis strain hall of fame, Blueberry would be inducted in the first round. This fruity strain has been a staple of the Cali MMJ scene since the 90s, and even recreational users love the effects.


Five shortest autoflower strains: fastberry auto

Fastberry Auto by Tripaholic88.

Our autoflowering version, the bushy Fastberry packs all the famed effects of the original onto a stout 24-43 inch or 120-centimeter structure. With the shortest flowering time, it's also one of our fastest growers, sometimes reaching full maturity within eight weeks.

“It is a very cerebral and euphoric Indica high but I wasn’t couch-locked. I really like to smoke this in the afternoon, that just seems to fit perfectly for me. the buds smell of SWEET earthy canna with berries. It’s very pleasant.”

Thanks to her Indica genetics, you can expect small dense buds that are completely covered in resin and boast bright green and pink hues. Look forward to the delicious blueberry and floral aroma that will overpower your room when smoking! 

Grow Tips

  • We recommend using at least a 10L pot to allow your plant to reach its maximum potential.
  • An ideal choice for outdoor growers suffering from cold wind and wet climates due to its ability to withstand harsh conditions.
  • A must for growers looking for stunning flowers with unique colors.

1. Rhino Ryder  23-43 inches

Rhino Ryder is truly special. A Fast Buds' original, we took strains from the popular Medicine Man/White Rhino lineage and crossed them with our autoflowers to create our shortest strain that packs buds with a punch.


Five shortest autoflower strains: rhino ryder auto

Armselmer18 says: “Easy to grow, no need too much care. We can feed normally and will get beautiful buds.”

Tripaholic88 from Grow Diaries describes it perfectly: "The high is at first a nice cerebral hit to the head resulting in an instant mood uplift that has you giggly and lasts for about 30-40 mins then slowly the body gets it until you are in an almost narcotic daze. Perfect for aches and pains."

Rhino Ryder Auto
5 out of 5
This strain was the biggest grower out of all my auto grows. The plant developed and unusually strong and thick stem from the beginning.
Verified customer
Reviewed 21 August 2015

This strain develops huge buds that form in the shape of a rhino’s horn and become so resinous that look like the whitest ivory. The buds will certainly make your mouth water due to the delicious mix of fresh cinnamon and pear terpenes that the buds reek of.

Grow Tips

  • A super tough strain, suited for any grower suffering cultivating in challenging conditions.
  • Extremely recommended for SOG growing due to growing uniform, compact, and short.
  • This genetics can be grown outdoors all year long without much maintenance, always finishing with dense and super frosty buds.






Max. Height


Green Crack AutoUp to 20%<1%90cm / 35inSpicy, Fruits, Floral, Mango
Grapefruit AutoUp to 20%<1%120cm / 47inGrapefruit, Floral, Fruits
CBD Crack AutoUp to 7%Up to 7%110cm / 43inMango, Floral, Peppery
Fastberry AutoUp to 19%<1%110cm / 43inBlueberry, Floral, Fruits
Rhino Ryder AutoUp to 20%Up to 1.2%110cm / 43inCinnamon, Earthy, Fruits, Peppery


In Conclusion

Technically, Rhino Rider and Fastberry tie for our shortest strain. While Rhino Ryder can, and usually does, grow shorter, its max height is just a few centimeters taller than Fasterberry's. Both are small marijuana strains and come from amazing lines, perfect for the stealth grower in need of weed with a kick.

If none of these strains are quite what you're looking for, you can always check out our full catalog where you’ll surely find a strain that suits your needs and your grow space, doesn’t matter if you want a short, tall, Indica, or Sativa, we will have what you need. Still doesn't solve your space problem? If you can only grow a limited number of plants, be sure to take a look at our guide on how to store your cannabis seeds

Also, make sure you check our Gorilla Cookies Auto, one of our smallest autoflowers released in 2020. 

Feel free to leave a comment in the comment section below and don't forget to follow us on Facebook and Instagram to stay up to date on all the latest news, strains, and giveaways from Fast Buds.


15 January 2021