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The Grapefruit Auto feminized autoflowering cannabis strain from Fast Buds Seeds is easy to grow, fast, and produces high yields. Its intense flavor is a combination of fruit nuances, citrusy grapefruit notes, and a hint of bitter oranges; an aromatic profile that goes hand in hand with a strong physical and mental effect.

Seeds per pack

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Type and genetics

The feminized autoflowering cannabis seeds Grapefruit Auto from Fast Buds Seeds are the result of crossing a Sour Citrus clone from Vancouver with Canadian Ruderalis. The result is a powerful, fast, and productive automatic hybrid with a great flavor.


Grapefruit Auto is an autoflowering strain that grows vigorously and develops compact-size plants (from 60 to 90cm), ideal for growers with space issues. This is probably one of the shortest and most robust genetics in Fast Buds' catalog, perfect for balconies, windows, rooftops in outdoor settings, or quick harvests in small indoor cabinets.

Aroma and flavor

The terpene profile of Grapefruit Auto produces a highly intense aroma and flavor with citrus notes, sour grapefruit, and bitter oranges on an earthy background. Due to its strong aroma, it is recommended to use a good odor filter when grown indoors.


The psychoactivity of Grapefruit Auto is quickly noticeable, offering a physical and mental effect that combines the mental clarity and stimulation of sativas with the physical relaxation of indica varieties. It is ideal for daytime consumption, sharing with friends, enjoying cheerfully, or combating stress.


Many may think that due to its small size, this variety produces low yields. Nothing could be further from the truth! Grapefruit Auto is a super productive strain that in indoor crops offers 400 to 600g per square meter, while in outdoor crops it can produce 50 to 250g per plant.


This autoflowering strain does not depend on lights to start flowering, therefore, it completes its full life cycle (from germination to harvest) in just 9-10 weeks.

The growing season is from April to October, but in regions with minimum temperatures above 10ºC, it can be grown all year round.

Sativa/Indica Ratio

Autoflowering hybrid


THC 20%

The Huerta's Opinion

Grapefruit from Fast Buds Seeds is an easy-to-grow strain, ideal for growers with space issues or for urbanites who want to make the most of their balcony or terrace. It is an ideal strain for making extractions due to its aromatic intensity.

Data sheet

Types of seeds
Autoflowering seeds
Indica sativa percentage
More sativa (stimulating)
Flowering time
Fast Flowering (45-55 days)
Strong effect
Citric flavour
Grapefruit flavour
Lime flavour
Orange flavor
Sour flavour
Sweet/fruity flavour
Other characteristics
Easy to grow
Humidity resistant

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