Grapefruit Auto by FastBuds Seeds

Grapefruit Auto seeds: the FastBuds grapefruit autoflower

Grapefruit Auto is one of the classic autoflowers (plants that flower with age rather than with the hours of light) from FastBuds, which presents it as "a legend". It comes from crossing Crocket's Tangie with Fast Buds Auto #1, the breeder's own autoflowering line. It is a balanced hybrid, 50% indica and 50% sativa, in feminized seeds (they only grow female plants, the ones that produce buds) of the F5 generation (the fifth bred generation, which makes plants more alike). At oaseeds we like it because it combines three things that rarely go together: a very defined grapefruit flavour, easy handling and good resistance to cold and damp.

Flavour, aroma and effect of Grapefruit Auto

FastBuds describes a fresh, bittersweet taste that blends grapefruit citrus with floral and fruity notes over an earthy base. What the breeder highlights most is the grapefruit aftertaste, which it calls very special. By harvest, the elongated, dense buds are coated in trichomes (the resin glands where aroma and cannabinoids concentrate), with bright orange pistils (the little hairs on the flower).

With up to 20% THC (the compound behind the psychoactive effect) and less than 1% CBD, FastBuds pitches it as a daytime strain. On its website, people who have tried it mostly talk about feeling relaxed and happy, and also energetic and uplifted. The breeder also stresses that its resin works very well for extracts (concentrates made from the resin), because it keeps the citrus profile.

How to grow Grapefruit Auto indoors and outdoors

FastBuds calls it "foolproof": a low-maintenance genetic, very easy to grow and ideal for beginners. The plant stays compact, between 80 and 120 cm, with a short and stocky structure. Its whole cycle, from seed to harvest, takes 9 to 10 weeks.

Indoors the breeder gives 400–550 g/m². Outdoors it yields 50 to 250 g per plant, depending on conditions. One of its strengths is that it grows well even in cold, wet climates and resists mould during rainy seasons. As an autoflower, you can sow it outdoors several times a year, without waiting for autumn to harvest.

Since its size is limited, sow it straight into its final pot: every transplant costs an autoflower days of growth. And if you grow in a rainy area, give it good airflow; even though it is resistant, its dense buds will thank you.

Grapefruit Auto characteristics

Frequently asked questions about Grapefruit Auto

How long does Grapefruit Auto take from seed to harvest?

From 9 to 10 weeks, according to FastBuds. As an autoflower, you don't need to change the light schedule: it flowers on its own once it is old enough.

How much does Grapefruit Auto yield?

Indoors, 400 to 550 g/m²; outdoors, 50 to 250 g per plant. The outdoor range is wide because it depends a lot on climate, pot size and sowing date.

Is Grapefruit Auto good for beginners?

Yes. FastBuds presents it as a foolproof, low-maintenance genetic that is easy to grow and also stands up well to mould and cold.

Is Grapefruit Auto indica or sativa?

It is a balanced hybrid: 50% indica and 50% sativa, with ruderalis genetics (the subspecies that brings the automatic flowering) inherited from Fast Buds Auto #1.