Autoflowering cannabis strains are popular amongst home-growers for many reasons; but their main asset is a fast growing cycle. Couple this with a warm climate (if you are fortunate enough to live in one), and you have a plant capable of producing multiple crops over the course of a year.

In this article, we take a look at the top 5 autoflowering strains that will flourish in warm environments. This list covers everything from sky-high sativas to couch-locking indicas and those in between—so you’re sure to find one that suits your needs.


No list would be complete without the inclusion of White Widow, and what better place to start than with it? Revered by many as one of the most famous cannabis strains in the world, White Widow Automatic does a fine job replicating the original strain, but with a much more reasonable growing time of 75–85 days.

This cultivar will thrive under the blazing sun, reaching a discreet height of roughly 50cm on average and producing around 190–240g/plant. The bud is pleasantly pungent—earthy and woody in both aroma and taste.

White Widow Auto

White Widow Automatic

White Widow Automatic Royal Queen Seeds

Genetic background White Widow x Ruderalis
Yield indoor 400 - 450 g/m2
Height indoor 40 - 80 cm
Flowering time 7 - 8 weeks
THC strength THC: 14% (aprox.) / CBD: Low
Blend 40% Sativa, 40% Indica, 20% Ruderalis
Yield outdoor 190 - 240 g/per plant (dried)
Height outdoor 50 - 110 cm
Harvest time 10 - 12 weeks after germination
Effect Physically stoned

Buy White Widow Automatic



Diesel Automatic is a next generation autoflowering hybrid strain. Selective breeding of NYC Diesel and Lowryder #2 has given rise to the premier auto strain without compromise. Virtually every desirable trait from each parent has been fine-tuned and enhanced in the offspring.

A decade ago nobody would have believed it possible to harvest 100g+ of top-shelf bud per plant from outdoor autoflowering plants under 1m tall. And definitely not in a total growing time of 8 weeks. Diesel Automatic is the autoflowering strain that might finally dispel the myth that autos cannot measure up to photoperiod strains.

Diesel Automatic is in a league of its own. Ultra potent and productive with no obvious weaknesses or downside risk. In a warm climate with minimal fertilisation, this strain will amaze even seasoned cultivators with how fast and frosty the nuggs fill out. For beginners or those with just enough space for one plant this summer make sure it’s Diesel Automatic.

Diesel Automatic

Diesel Automatic

Diesel Automatic Royal Queen Seeds

Genetic background Diesel x Ruderalis
Yield indoor 325 - 375 g/m2
Height indoor 40 - 70 cm
Flowering time 7 - 8 weeks
THC strength THC: 14% (aprox.) / CBD: Low
Blend 40% Sativa, 30% Indica, 30% Ruderalis
Yield outdoor 60 - 110 g/per plant (dried)
Height outdoor 60 - 110 cm
Harvest time 8 -9 weeks after germination
Effect A clean and clear high without euphoria

Buy Diesel Automatic



Stress Killer Automatic CBD is our CBD-rich selection for this list. And, although you won’t get the high you’d expect from other plants, the power of CBD is not to be underestimated. Now you have the opportunity to grow a high-quality CBD-rich auto in less than 11 weeks from seed.

This three-way cross of Lemon Haze, Juanita la Lagrimosa, and ruderalis will produce a generous yield of up to 160g/plant. The bud has a strong, but not overwhelming, citrusy aroma that will entrance you alongside its 11% THC content and high CBD content.

Stress Killer Auto

Stress Killer Automatic

Stress Killer Automatic

Genetic background Lemon Shining Silver Haze x Juanita la Lagrimosa x Ruderalis
Yield indoor 450 - 5002
Height indoor 90 – 140
Flowering time 7 - 8 weeks
THC strength THC: 11%(aprox.) / CBD: High
Blend 60% Sativa, 30% Indica, 10% Ruderalis
Yield outdoor 110 - 160 g/per plant (dried)
Height outdoor 120 – 160 cm
Harvest time 10–11 weeks after planting
Effect Clear High, Mental Focused

Buy Stress Killer Automatic



An unabashed award-winning strain, Royal Critical Automatic is one of the most popular strains available here at Royal Queen Seeds. While not as potent as the original (containing 14% THC), this strain has been included for its ease and pace of growth.

Standing at around 55–65cm in height, don’t think this plant will come up short in its offerings. Taking just 9 weeks to reach harvest, its yield clocks in at around 165g/plant. Not bad for a plant so small in stature. In warm climates, Royal Critical Automatic will bloom beautiful, chunky buds for you to enjoy, taking on distinct aromas of wood, spice, and sweetness.

Royal Critical Auto


Royal Critical Automatic Royal Queen Seeds

Genetic background Critical x Ruderalis
Yield indoor 350 - 400 g/m2
Height indoor 55 - 65 cm
Flowering time 6 - 7 weeks
THC strength THC: 14% (aprox.) / CBD: Low
Blend 1Sativa 15%, Indica 50%, Ruderalis 35%
Yield outdoor 115 - 165 g/per plant (dried)
Height outdoor 90 - 140 cm
Harvest time 8-9 weeks after sprouting
Effect Relaxing and full of flavour

Buy Royal Critical Automatic



Royal Jack Automatic is a hardy hybrid blend of the legendary Jack Herer and autoflowering genetics. Optimal environmental conditions, like a sun-drenched southern European summer, can bring out the very best in the Royal Jack Automatic.

After germination these seeds will race to harvest in just 9-10 weeks. This kind of vigorous development makes two well-timed harvests possible. Weather permitting a bountiful harvest is a sure thing in a warm climate. Perfect for a first time discreet balcony/terrace grow.

Royal Jack Auto

Royal Jack Automatic

Royal Jack Automatic Royal Queen Seeds

Genetic background Jack Herer x Ruderalis
Yield indoor 350 - 400 g/m2
Height indoor 40 - 80 cm
Flowering time 6 - 7 weeks
THC strength THC: 16% (aprox.) / CBD: Low
Blend 40% Sativa, 30% Indica, 30% Ruderalis
Yield outdoor 70 - 120 g/per plant (dried)
Height outdoor 60 - 80 cm
Harvest time 9 - 10 weeks after planting
Effect A motivating and inspiring feeling

Buy Royal Jack Automatic


If you are lucky enough to be growing marijuana outdoors in an idyllic environment with fertile soil, fresh water and long sunny days remember too much sun can be a bad thing.

Should temps rise above 28°C even the most robust autoflowering plants will get burned and have trouble photosynthesising. Invest in shading to protect your plants. Build a simple shade with some shade cloth and keep roots cool with some straw bedding on the top soil.


So, there you have it—those are our top 5 autoflowering strains for warm climates. If, however, this article was not "hot" enough for you (say, because you live in an arid region with seriously high temperatures), you may want to have a look at our blog on growing cannabis in drought conditions.

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