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Grapefruit Auto

A Fruity Phatty That’s Already a Legend!
9,00 €
In stock
1 feminized seed
9,00 € / seed
1 feminized seed
9,00 € / seed
2 feminized seeds
8,00 € / seed
3 feminized seeds
8,00 € / seed
5 feminized seeds
8,00 € / seed
10 feminized seeds
7,00 € / seed
25 feminized seeds
6,00 € / seed
50 feminized seeds
5,00 € / seed
100 feminized seeds
4,20 € / seed
500 feminized seeds
2,90 € / seed
1000 feminized seeds
2,40 € / seed
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  • Flawless fruity terps. Fresh sour grapefruit with earthy undertones, a remarkable flavor for extractions.
  • Short and stocky. Perfect for growers with limited space, this strain grows around 90cm and conveniently compact.
  • Foolproof. A low maintenance genetic, super easy to grow.
  • Grow in cold! A highly reliable plant that grows well even in cold and wet climates.
  • Expect the best. In just 70 days you’ll be rewarded with 600gr/m2 of top-shelf buds, hard to beat it.
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Tech Radar

Grapefruit Auto
Climate Intended
Very Hot
Very Cold
Mostly Sativa
Mostly Indica
Very Strong
No filter needed

Tech Specs

Parameter Value
Taste Grapefruit, Floral, , Fruits
THC Up to 20%
CBD < 1%
Harvest EU Indoor 400 – 550 gr/m2
Harvest US Indoor 1.3 – 1.8 oz/ft2
Harvest EU Outdoor 50 – 250 gr/plant
Harvest US Outdoor 2 – 9 oz/plant
Size XL
Height 80 – 120 cm
Height US 31 – 47 inches
Flowering 9 – 10 weeks
Room Indoor/Outdoor
Gender Feminized
Genes Sativa 50%/Indica 50%
Genetics Grapefruit Auto
Type Autoflowering
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Instagram Grapefruit Auto
Instagram Grapefruit Auto
Instagram Grapefruit Auto
Instagram Grapefruit Auto


A large producing, autoflowering hybrid with a very special and unique grapefruit aftertaste. Flavor chasers will love this strain, as she is easy to grow and ideal for beginner growers. Potent with THC levels testing at 20% and a very generous producer, meaning commercial growers will enjoy working with this strain. Thanks to her high resistance and rapid growth, she can be planted outdoors multiple times a year, without suffering from mold or mildew during the wetter season. Hash makers and extract artists will find Grapefruit Auto to be a very worthy strain and can produce some sensational extracts.

Bud description

Large-sized and elongated dense nugs, caked in trichomes. There is an abundance of closely packed orange pistils giving her a beautiful bag appeal and making her really stand out.

Smoke report

Thanks to the balance of Indica and Sativa genetics, effects can be experienced by a harmoniously creative, cerebral focused high, that gently mellows out to a soothing physical body. An excellent choice for morning and daytime use, social scenarios, and a way to stay focused and relaxed during the daytime, while enjoying some delicious fruity flavors.

Plant Appearance

A short and stocky hybrid that is well recommended to growers with limited space, and those looking for a discreet, low maintenance strain. Her final height will vary between 60-90cm, where she is able to produce yields of 400-600gr/m2 when grown closely together in a Sea of Green. Flowering time from seed until harvest will take between 9-10 weeks, during this time she will pack on the weight and begin to shine.

Sealed to ensure authenticity
Waterproof Coating
Aluminium interior lining
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Protective sticker
QR code
Scratchable serial number

Grow Tips

A perfect hybrid for growers who experience short summers, and need a fast and reliable producer. A low profile plant that has a very short flowering time also, suitable for cold and wet climates. To increase the yield capabilities of Grapefruit Auto even further, grow as many plants as you can closely together, as she’s a great choice for SOG method. Due to her already discreet size, with some LST applied, she’s a great choice for balcony, terrace, or back garden grows. Beginner growers will find this autoflowering hybrid to be easy work and require very little maintenance.


If you like fruity and floral terps then this is the strain for you. A smooth sweet and sour cocktail, with overtones of fresh grapefruit and earth. Her extracts are superb and will really enhance her exotic, bittersweet, grapefruit flavors, making her perfect for morning dabs.


Relaxed Relaxed
51% of people reported feeling Relaxed
Happy Happy
38% of people reported feeling Happy
Uplifted Uplifted
31% of people reported feeling Uplifted
Energetic Energetic
29% of people reported feeling Energetic
Giggly Giggly
27% of people reported feeling Giggly
Hungry Hungry
25% of people reported feeling Hungry
Creative Creative
20% of people reported feeling Creative
Sleepy Sleepy
16% of people reported feeling Sleepy
Talkative Talkative
13% of people reported feeling Talkative

Compare with similar strains

Up to 20%
400 – 550 gr/m2
50 – 250 gr/plant
80 – 120 cm
9 – 10 weeks
Sativa 50%/Indica 50%
Up to 24%
450 – 600 gr/m2
60 – 300 gr/plant
90 – 130 cm
9 – 10 weeks
Sativa 65%/Indica 35%
Up to 26%
400 – 500 gr/m2
70 – 160 gr/plant
60 – 100 cm
8 – 9 weeks
Sativa 15%/Indica 85%
Up to 24%
450 – 550 gr/m2
50 – 170 gr/plant
80 – 100 cm
8 – 9 weeks
Sativa 50%/Indica 50%

Customer reviews

4.8 of 5
42 customer ratings
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Valero. Verified customer
Reviewed 27 January 2020
Different phenos
I grew 2 at the same time and they look quite different.
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Reviewed 29 November 2018
nice genetics
nicely done genetics with very few drawbacksrecommended
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Reviewed 16 November 2016
I´m going to chop it now
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Reviewed 18 September 2016
73 days finish.
Rhyno Ryder, Californian Snow, Grapefruit, West Coast OG, 73 days finish Grapefruit .35,39,50,55,61 days photonoted weak resistance to pests street, caterpillars and mites. (Not helping drug treatment), otherwise the quality 4+
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Reviewed 17 August 2015
this is the most fruity sour smoke
this has realy got my attention as I realy dig a fruity sour smoke. u got any other strains like this?
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Reviewed 22 November 2015
Indica pheno
i must have gotten an indica pheno cause i got an early indica but was like almost 4 feet tall and finished in 55 days giving me 389 grams wet just under 4 oz dry..dripping in trichomes have another stocky indica pheno but looks nothing like the texs pheno which lookslikeit should yield 8 zips with proper care!
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Fast Buds
Commented 11 April 2016
Bushy Grapefruit with dense buds.
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Reviewed 9 September 2015
Fruity and spicy smell.
All five seeds germinated after 24 hours. Rapid growth at the beginning. Outdoor for 60 days at a good location with over 6 hours/day of direct sun, good potting soil and some feeding. Grown 3x60cm and 2x90cm.
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Garlic Knots
Reviewed 16 March 2023
Funky Fruity Rocket Ship
This round I grew two Grapefruit side by side in my little tent. Got two different phenotypes, which should be expected when starting any strain from seed. Right from the start when rubbing the leaves you could smell grapefruit peel. My #1 plant grew very much like a bouquet, with the side branches almost even with the main cola. The buds were on the small side but everything was absolutely covered in trichomes. The smell was a deep funk with bitter grapefruit rind that was so strong it was verging on cat piss. I know that sounds offputting, but it was an amazing smell. Dropped her at Day 71. Ended up yielding 80 grams off her, and the smoke is AMAZING. It tastes like a fruity diesel and the high is absolute motivation. A pleasant buzz with a fairly clear head unless you smoke a lot. Very stimulating for learning, hiking or enjoying time with friends. No hard comedown and smoking enough will cause a relaxing couchlock. The #2 plant grew like a bushy Christmas tree. Super fat buds with trichomes stacked on trichomes stacked on trichomes. Incredible candy grapefruit smell, more like the fruit than the peel/rind. There are also some notes of peach and pineapple, extremely similar to Cinderella. Ended up harvesting at Day 87 and yielded 125 grams! It should also be mentioned I only went half strength with my nutrients the entire run and still received an extremely respectable yield without any deficiencies.
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Commented 11 May 2023
How was the smell ?
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Reviewed 20 September 2022
Definitely in my top 5 of all time strains. This example from FastBuds is a must try even if you don't particularly like grapefruit the fruit. Very easy to grow, very forgiving & durable & the taste & smell? Try it & you'll see why I rate it so highly, literally.
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Reviewed 5 June 2021
I had 2 plant come up out of 1 seed can see the smaller plant of the 2 is going to be more like just a main collar and the bigger one is going to have more branches
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Grapefruit Auto
Grapefruit Auto' pack backside
Grapefruit Auto
Grapefruit Auto' pack frontside

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Customer questions & answers

1 votes
Hey fastbuds! I wanna grow 2 strains side by side (OG and Grapefruit) in a 33" x 25" x 74" (6sqft) tent under 250w HPS. How much plants do you recommend? Cant wait to try your seeds! cheers
Hi, Errday! thanks for asking!Well, it depends on your light power and on the size and the shape you wanna get. More than 8 would be too much maybe.Hope it helps a bit! Keep us updated :)Thanks!
by errday taylor 15 October 2016