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Top 10 Best Outdoor Autoflower Seeds UK 2021

Top 10 autoflowering strains to give you an advantage in the cold and humid UK weather.
14 July 2020
10 min read
Top 10 Best Outdoor Autoflower Seeds UK 2021

  • 1. Climate in the united kingdom
  • 2. Gelato auto
  • 3. Gorilla cookies auto
  • 4. Strawberry pie auto
  • 5. Zkittlez auto
  • 6. Purple lemonade auto
  • 7. Lemon pie auto
  • 8. Stardawg auto
  • 9. Wedding cheesecake auto
  • 10. Strawberry banana auto
  • 11. Purple punch auto
  • 12. In conclusion

If you’re an outdoor grower and are looking for the best autoflower cannabis seeds in UK, here is our top 10 seeds selection for 2021.

1. Climate In The United Kingdom

The climate in the UK is usually very humid and cold. You have to choose the strains carefully to avoid problems. By knowing the weather for the next couple of months you can plan your cultivation so you start when there's good weather and a good amount of sunlight hours. By having (and understanding) a chart like this, you will ensure your plants grow in the best climate possible, this way you can predict when you'll have more sunlight for your plants to develop better, an appropriate temperature so your plants develop properly and less humidity so you don't suffer from bugs or plant disease, ultimately resulting in bigger yields, less problems, and an overall healthier plant.


MonthMax. temperature C°(F°)

Min. Temperature C°(F°)

Sunlight HoursRel. Humidity

 18.6 (65.5)

 9.7 (49.5) 16hs 75%

 20.4 (65.5)

 11.7 (53.1) 16:30hs  69%

 20.1 (68.2)

 11.5 (52.7) 16hs 72%

 17.5 (63.5)

 9.6 (49.3) 14hs 76%

Climate in the United Kingdom month-by-month1.

It’s ideal to grow Indica dominant strains and preferably good genetics that are highly resilient for cold and humid climates. 

Cold and humid climates tend to attract bugs and mold so it's crucial you take good care of your cannabis plants in climates like this.

Here’s our top 10 strains that will give you an advantage over the harsh climate outdoor growers in the UK suffer from. Just remember that depending on where you are growing (balcony, backyard, etc..) you will want to look for a low odor autoflower seeds that grow well in the UK.

2. Gelato Auto

This strain has become a flagship for its delicious flavor, it is a stable plant that takes harsh climates very well, making it ideal for growers who want fast-flowering autos that produce top-quality buds.

Gelato Auto
5 out of 5
I recommend this to everyone! Super powerful with great flavors and yield. I think it was easy to grow. This is awesome strain!
Verified customer
Reviewed 10 June 2020

It's an extremely potent and resilient strain, develops really well in cold and humid climates, and with up to 26% THC. A great choice to grow outdoors in the UK, not only for the potency but for the high resiliency.


Top 10 Best Outdoor Autoflower Seeds UK 2021: Gelato auto

Gelato from our grower Wildeweed from Grow Diaries.

Grow Tips

  • Due to her bushy foliage, it is recommended light defoliation or LST training to avoid mold and pests.
  • Her extreme resin production makes her a good choice for making hash or other extractions.

3. Gorilla Cookies Auto

Thanks to its Indica lineage, this strain grows compact, robust, and is extremely resistant to diseases and cold weathers, these traits will give you an advantage when growing outdoors in cold and humid climates like in the UK.

Gorilla Cookies Auto
5 out of 5
I got 134g off this gal growing in 3 gal pot with 24 hours of light. i'm stoked with the result! Smells like diesel. Was a great grow overall.
Verified customer
Reviewed 24 June 2020

By providing an appropriate pH level and good nutrients you’ll be amazed at the insane trichome production, even needing to provide support so the branches don’t snap due to the huge dense buds that can yield up to 550gr/m2 in 70 days!.


Top 10 Best Outdoor Autoflower Seeds UK 2021: Gorilla cookies auto

Gorilla Cookies from our grower Hawkbo.

Grow Tips

  • Gorilla Cookies can take a big feeding especially during week 3 and onwards, make sure you feed her properly to increasean autoflowering plants yields and overall quality of your harvest.
  • This incredible producer may need support when flowering, make sure you have bamboo stakes available for the last weeks of flowering.
  • We recommend tying the branches or performing LST to avoid mold and provide more airflow for the buds to develop better.

4. Strawberry Pie Auto

This Indica dominant hybrid is easy to grow, suited for pros and beginners who will be rewarded with a prime-quality delicious resin, it’s also a great choice to grow outdoors in cold and humid climates like in the UK because of her Indica lineage. 

Strawberry Pie Auto
5 out of 5
First time on this strain first time lst . It was great although I made many mistakes with the PH , she treated very well.
Alba7 .
Verified customer
Reviewed 1 May

Have in mind that even though she can resist cold climates and mold, you should perform LST to provide more airflow to the buds, this way you avoid mold and bugs that thrive in humid climates and can attack your plants.


Top 10 Best Outdoor Autoflower Seeds UK 2021: Strawberry pie auto

Strawberry Pie from our grower Smokinghills_9.

Grow Tips

  • This strain prefers light feedings, make sure you water accordingly and let at least 80% of the soil dry before watering, to avoid bugs that reproduce in wet organic matter, like Fungus Gnats.
  • Make sure you flush properly during the final weeks of flowering, this way you make her colors stand out and guarantee a smooth smoke, and a strong aroma and flavor.
  • By low stress training your plant (with LST or other methods), you can yield more than 550gr/m2 in around 8-9 weeks.

5. Zkittlez Auto

A delicious candy-sweet Cali strain that conquered every consumer's stash due to its delicious taste; Thanks to its Indica heritage, this hybrid grows compact with multiple bud sites and it’s super easy to grow outdoors, requiring low maintenance.

Zkittlez Auto
5 out of 5
Just an easy to grow, solid packed buds. A heavy feeder and can be a bit prone to light burn at the end but otherwise perfection!
Verified customer
Reviewed 21 November 2020

Because this plant grows a lot of side branches close together with dense buds, we recommend tying them down to avoid problems with mold, due to the humid climate in the UK.


Top 10 Best Outdoor Autoflower Seeds UK 2021: Zkittlez auto

Zkittlez from our grower UnkleSkunk.

Grow Tips

  • Being one of our hefty producers, we recommend providing support so the branches can withstand the weight of the buds.
  • This strain tends to need a lot of nutrients, so we recommend you feed her quite heavily and with good quality nutrients.
  • To avoid bugs, it is highly recommended you LST, providing more airflow in between the buds and branches.

6. Purple Lemonade Auto

Purple Lemonade is a vigorous and sturdy strain and is a great choice both for indoor and outdoor growers who will be rewarded with beautiful purple buds that reek of a mouth-watering citrusy aroma.

Purple Lemonade Auto
5 out of 5
Beautiful colour and she did turn purple two and a half weeks before harvest she smells like a fruity stardawg can't wait til curing is done
Verified customer
Reviewed 7 July

Even though she develops exceptionally well without nutrients, you can have an amazing harvest by providing good quality nutrients and proper usage.


Top 10 Best Outdoor Autoflower Seeds UK 2021: Purple lemonade by pharmaz on growdiaries

Purple Lemonade from our grower bigdaddyk.

Grow Tips

  • Flushing during the last two weeks is recommended to make her flavor and smell really stand out.
  • Because this strain can grow up to 110cm, we recommend performing LST of tying down the branches to keep your plants discreet.

7. Lemon Pie Auto

This hybrid is super easy to grow, well suited for beginners and for lovers of Indica hybrids with Lemony terpene profiles, It's very resistant to pests and mold while requiring low maintenance, making it a great choice for outdoor growers, who look for an extremely resinous strain.

Lemon Pie Auto
5 out of 5
Easy to grow and she stretched quite a bit during flower. Regarding the flowers, they smell real good and taste ver sweet.
Verified customer
Reviewed 5 August 2020

Just like the Strawberry Pie Auto, this Indica dominant strain grows dense and bushy, with a lot of side branches, and even though it’s a highly resilient strain, due to the climate in the UK we recommend LST or other forms of plant training to avoid pests and mold.


Top 10 Best Outdoor Autoflower Seeds UK 2021: Lemon Pie Auto from our grower Hawkbo 

Lemon Pie from our grower Hawkbo.

Grow Tips

  • Remember to always keep an appropriate pH level for the medium you’re growing in, this way you ensure your plant is absorbing nutrients properly and avoid any problems.
  • We recommend growing Lemon Pie in 15L pots to make sure the plant develops to its fullest.
  • By low stress training your plant (with LST or other methods) you prevent mold and can ultimately yield more than 550gr/m2 in around 9 weeks.

8. Stardawg Auto

Stardawg Auto is ideal for new growers and pros, she can easily forgive novice’s mistakes and can put up with training methods while easily rewarding you with up to 550gr/m2 in 63 to 70 days.

Stardawg Auto
5 out of 5
She grew quite tall and I got a good yield off her. About 1000g in wet bud, so I think once it's dried it's gonna be a good harvest.
Verified customer
Reviewed 22 March 2020

Even though this is a robust and resilient plant (ideal for growing outdoors), she grows quite bushy due to her Indica heritage so we highly recommend LST techniques. Because the UK has a humid and cold climate, the extremely dense buds can get mold if you don’t provide good airflow.


Top 10 Best Outdoor Autoflower Seeds UK 2021: Stardawg auto

Stardawg from our grower Hawkbo from Grow Diaries.

Grow Tips

  • We recommend LST techniques not only to improve yields but also avoid any kind of problem with bugs and mold.
  • Beware, this plant reeks of pine and diesel, and the smell can be hard to mask when growing outdoors.

9. Wedding Cheesecake Auto

This is one of the most powerful strains from Fast Buds. A super easy to grow plant with a powerful terpene profile, perfectly fit for new growers.

Wedding Cheesecake Auto
5 out of 5
Beautiful plants, and consistent among the three. I topped all of them and got around 115g off each in 2 gallon pots. Very pleased
Verified customer
Reviewed 9 December 2020

Thanks to her Hybrid lineage she grows exceptionally well in cold climates (ideal for the UK), as she is used to the cold California night times and doesn’t require a lot of maintenance while yielding up to 600gr/m2 in around 63-70 days. 


Top 10 Best Outdoor Autoflower Seeds UK 2021: Wedding cheesecake auto

Wedding Cheesecake Auto from our grower.

Grow Tips

  • Be careful when growing outdoors, the terpene profile on this strain can be felt from far away.
  • Make sure to give her enough nutrients, as this strain tends to take a lot of nutrients to develop to its maximum.

10. Strawberry Banana Auto

This is one of our most potent strains, an unbelievably easy to grow autoflowering plant, great for beginners. This Indica hybrid is a very popular choice for growing outdoors in a cold harsh weather like in the UK due to her lineage.

Strawberry Banana Auto
5 out of 5
StrawNana is my favorite strain of the past few years, so I'm stoked to get this auto version started, thanks for the killer stains Fast Buds!
Verified customer
Reviewed 13 April

You will be amazed by her ability to fight off bugs, and withstand cold weathers, while yielding 600gr/m2 of beautiful resinous and dense buds in around 10-11 weeks, a perfect variety for the lovers of trichome-rich strains.


Top 10 Best Outdoor Autoflower Seeds UK 2021: Strawberry banana auto

Strawberry Banana Auto.

Grow Tips

  • We recommend flushing 2 weeks prior to harvest to remove excess nutrients and reveal her true flavor and aroma.
  • Even though she’s highly resilient to cold and humidity, we recommend LST to provide air flow to avoid bugs when growing outdoors.

11. Purple Punch Auto 

Purple Punch Auto is very easy to grow and one of our most productive strains, a great strain to grow in the UK because thanks to her Indica heritage she can yield up to 600gr/m2 even in cold climates.


Even though she can withstand harsh climates, we recommend LST techniques to provide more airflow to the buds, because they are extremely dense, water can get stuck in them and that is where mold thrives.


Top 10 Best Outdoor Autoflower Seeds UK 2021: Purple punch auto

Purple Punch Auto from our grower.

Grow Tips

  • Be extremely careful when growing outdoors as she reeks of a pungent smell and can bother your neighbors.
  • Despite growing tall this plant develops quite compact, perfect for a discreet outdoor grow.

12. In Conclusion

If you’re thinking of starting your next growing cycle outdoors you can’t go wrong with these strains, and if you're a medical patient, have a look at our autoflower CBD seeds for the UK. Have in mind that even if they’re resistant to disease and cold climates, they still need a minimum amount of maintenance and care so you avoid any problems. Remember that even though these strains grow well outdoors in colder and more humid climates such as in the UK, you can always build a basic greenhouse structure to protect your crop from stronger wind, rain or snow. The strains mentioned in the blog are quite resistant to colder climates but they're living beings so if you want to get the most out of every single plant, it's a good idea to keep them well-fed, protected from rain or snow, and keep an eye on them every day to make sure there are no signs of pests or mold attacking your garden.

We hope our 2021 autoflowering cannabis seeds for the UK selection will help you to prepare for your outdoor growing season in the UK and if you have grown autoflowering strains in the harsh climate before share your experience in the comment section.


This post was most recently updated on April 26, 2021.



   1. UK Met Office: http://www.meteomont.gov.it/infoMeteo/jsp/mwablx812I.jsp 

14 July 2020