You may have heard about autoflowering cannabis, or perhaps you’ve grown it yourself! Autoflowers feature ruderalis genetics, a wild and robust subspecies of cannabis. Ruderalis provides certain characteristics that make autoflowers ideal for growing, both indoors and out.

Autoflowers don’t depend on light hours to flower like photoperiod strains do. Instead, they flower automatically after 3–4 weeks of vegetative growth. Autos also grow very fast, compact, and resilient. What’s not to love? It used to be that autoflowering strains lacked potency and flavour, but that is simply not the case today.

Aside from ruderalis, cannabis is divided into two broad categories known as indica and sativa. Although strain science is much more complex than these names indicate, indicas tend to grow shorter and stockier, and deliver relaxing, body-centric highs. Sativas, on the other hand, are known to grow tall and deliver a heady and uplifting buzz. Normally, sativas take a very long time to flower. To solve this issue, breeders have infused top sativa strains with ruderalis to create lightning-fast autoflowering varieties.

With that in mind, here is a list of the top five ruderalis sativa strains you should grow in 2020.


Amnesia Haze is a classic sativa strain bred in the Netherlands in the 90s. Known for its energetic, uplifting high and wonderful spicy-citrus aroma, it is a respected crowd-pleaser. The only downside is its very long flowering time of at least 12 weeks. This problem was solved by crossing Amnesia Haze with ruderalis, creating Amnesia Haze Automatic.

Amnesia Haze Automatic is a sativa-dominant hybrid that retains all the best qualities of the original while cutting down significantly on flowering time. Indoors, it will take this strain around 80 days from seed to bud, while the regular Amnesia Haze requires that amount of time just to flower. Despite being an autoflowering strain, the sativa genetics come to the fore in her morphology. She features long, thin leaves and large, luscious buds, but rarely exceeds 120cm in height. The yield is generous with up to 400g/m² indoors and 180g/plant of long, foxtail-like buds outdoors.

Amnesia Haze

Amnesia Haze Automatic


Genetic background Amnesia x Ruderalis
Yield indoor 350 - 400 g/m2
Height indoor 50 - 100 cm
Flowering time 8 - 10 weeks
THC strength THC: 18% (aprox.) / CBD: Low
Blend 50% Sativa, 20% Indica, 30% Ruderalis
Yield outdoor 130 - 180 g/per plant (dried)
Height outdoor 100 - 120 cm
Harvest time 10 - 12 weeks after germination
Effect Cerebral and uplifting

Buy Amnesia Haze Automatic



Another sativa-dominant hybrid, Royal Dwarf is a cross between the original Skunk and a ruderalis variety. It is a very compact strain with tight buds, almost bonsai-like in appearance. This makes her perfectly suited for indoor or micro-growing. With an average height of around 40–60cm and an average yield of 80g/plant outdoors, Royal Dwarf offers a lot of bang for your buck. And, of course, Royal Dwarf is really fast, racing from seed to harvest in a mere 8–9 weeks.

The high from Royal Dwarf is physical and deeply relaxing, with a mild euphoric effect typical of Skunk hybrids. It will soothe your soul, but won’t keep you glued to the couch. A heavy skunky aroma with a hint of diesel best describes this strain's flavour profile. For all these reasons and more, clandestine and guerrilla growers have made Royal Dwarf one of their perennial favourites.

Royal Dwarf

Royal Dwarf

Royal Dwarf Royal Queen Seeds

Genetic background Skunk x Ruderalis
Yield indoor 150 - 200 g/m2
Height indoor 40 - 70 cm
Flowering time 6 - 7 weeks
THC strength THC: 13% (aprox.) / CBD: Low
Blend 60% Sativa, 10% Indica, 30% Ruderalis
Yield outdoor 30 - 80 g/per plant (dried)
Height outdoor 50 - 90 cm
Harvest time 8- 9 weeks after germination
Effect Physically stoned

Buy Royal Dwarf



Green Gelato Automatic is the autoflowering version of a new cannabis legend. Made with the best Cookies genetics, namely the delicious Thin Mint Cookies and Sunset Sherbet, this sativa-dominant auto isn’t just one of the most aromatic you can set a light to; with 24% THC, she's also one of the most potent. The autoflowering variant of Green Gelato couldn’t be easier to grow. The plant won’t get taller than 120cm and is very easy to manage. In a quick 70 days from seed, she produces a respectable bounty of extremely resinous buds: up to 450g/m² indoors and 175g/plant outdoors.

When smoked, her powerful cerebral effect immediately gets to work stimulating creativity and motivation. She is a good smoke for all kinds of creative activities, such as writing, playing games, or making music. With her upbeat effect, she’s great fun to share with others. Plus, her sweet and earthy flavours will make your mouth water as soon as you open your stash jar.

Green Gelato Automatic

Green Gelato Automatic

Green Gelato Automatic Royal Queen Seeds

Genetic background Green Gelato x Cookies Auto
Yield indoor 400 - 450 g/m2
Height indoor 70 - 120 cm
Flowering time 7 - 8 weeks
THC strength THC: 24% (aprox.) / CBD: Low
Blend 55% Sativa, 40% Indica, 05% Ruderalis
Yield outdoor 100 - 175 g/plant (dried)
Height outdoor 100 - 120 cm
Harvest time 9-10 weeks after sprouting
Effect Physical, clear high

Buy Green Gelato Automatic



HulkBerry Automatic is Royal Queen Seeds’ take on the mighty Bruce Banner #3 Auto. Crossing Ghost OG, Strawberry Diesel, and Diesel Auto, she packs enormous potency and adds superb flavour to boot. HulkBerry Automatic is a great strain for growers of all experience levels, including those who are just starting out. Rarely exceeding 100cm in height, this girl fits even in small tents. Plant your seed indoors, and 65–70 days later she’ll deliver as much as 500g/m². Plant her outdoors, and you can see up to 150g/plant.

This 65% sativa contains 21% THC, which makes her one of the more potent autoflowers. Take a puff to enjoy a surge of uplifting euphoria. The strain goes great with all kinds of creative endeavours, from making and listening to music to watching movies. Perfect for a wake and bake in the morning. Her mouth-watering smoke blends woody tones with fruity, spicy, and earthy notes for an all-around exceptional autoflower.


Hulkberry Automatic

Hulkberry Automatic Royal Queen Seeds

Genetic background Hulkberry x Diesel Auto
Yield indoor 450 - 500 g/m2
Height indoor 80 - 120 cm
Flowering time 6 - 7 weeks
THC strength THC: 21% (aprox.) / CBD: Low
Blend 65% Sativa, 30% Indica, 05% Ruderalis
Yield outdoor 100 - 150 g/plant (dried)
Height outdoor 80 - 120 cm
Harvest time 8-9 weeks after sprouting
Effect Warm

Buy Hulkberry Automatic



Royal Queen Seeds took the esteemed Haze Berry and crossed her with a select ruderalis variety to make the strain autoflowering. Out comes a sativa-dominant (65% sativa) hybrid that shines with all the characteristics that made her bigger sister so famous. You will enjoy a fabulous energising high paired with the delicious flavours from Blueberry. This easy-growing autoflower won’t get taller than 100cm—ideal for small tents or balconies. Just 70 days from germination won’t have you waiting long to harvest 350–400g/m² indoors or 150g/plant outdoors.

With 13% THC, Haze Berry Automatic may not be particularly strong, but don’t be fooled. She delivers the same cerebral buzz as Haze Berry, with an uplifting and energising effect that some compare to a cup of coffee. The lower THC levels allow you to better manage her effect, making the strain ideal for daytime smoking. Her buds emanate fruity and sweet notes, and her high resin content makes Haze Berry Automatic a good choice to enjoy in a vaporizer.

Haze Berry Automatic

Haze Berry Automatic

Haze Berry Automatic Royal Queen Seeds

Genetic background Haze Berry x Blueberry Auto
Yield indoor 350 - 400 g/m2
Height indoor 90 - 130 cm
Flowering time 8 - 9 weeks
THC strength THC: 13% (aprox.) / CBD: Low
Blend Sativa 65%, Indica 30%, Ruderalis 5%
Yield outdoor 100 - 150 g/per plant (dried)
Height outdoor 80 - 130 cm
Harvest time 10–11 weeks after sprouting
Effect Extremely high, long-lasting, body relaxing

Buy Haze Berry Automatic

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