Grapefruit Haze
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Grapefruit Haze

Sativa-dominantTHC-dominant

Grapefruit Haze is a cross of BC Grapefruit and Super Silver Haze from Next Generation Seed Company that took 3rd place among the sativas at the 2018 Karma Cup.

Research as of 11/01/2026

At the 2018 Karma Cup in Toronto, Grapefruit Haze took 3rd place in the category for sativa buds. The sample was not submitted by the breeder but by another participant. The cross of BC Grapefruit and Super Silver Haze was bred by Next Generation Seed Company, a Canadian seed company that, according to its own company description, was founded in 1997.

Genetics and Origin:

According to the strain descriptions, the pollen came from an F4-generation Grapefruit male, and the mother was a Super Silver Haze plant. The father's side was meant to supply grapefruit flavor and robustness, the Haze mother dense buds and a spicy tone. Super Silver Haze traces back to Green House Seeds and combines Haze with Skunk #1 and Northern Lights #5.

The sources disagree on classification. Next Generation Seed Company lists Grapefruit Haze as largely sativa-dominant, while another description sees a balanced hybrid and calls BC Grapefruit an indica.

The strain appears as a parent in several more recent crosses, including Ninja Fruit from Dojo Seed Co. with Grape Ape, Pomelo from Rheinland Genetics with Cinderella 99 and Mastodon Haze from Stillwater Genetics. The breeder itself used it for Hazy Daze Auto, an autoflowering line that also incorporated Amnesia Haze and ruderalis.

Aroma and Flavor:

Next Generation Seed Company describes the aroma as predominantly fruity, with a spicy component from the Haze line. Strain descriptions list grapefruit, citrus and pepper; one of them also names berries, grapes, herbs and diesel. In several reports, consumers mention grapefruit, in some cases with a peppery sharpness. Lavender, a lemony, almost sour note or earthy tones come up occasionally, and some found the smoke harsh. One grower compared the smell of the harvest to grapefruit peel.

Strain descriptions give myrcene as the dominant terpene, followed by pinene. Depending on the source, limonene or caryophyllene and humulene are added.

Effects:

The breeder speaks of a cerebral effect. The core of the user reports is an energizing, mood-lifting effect with a clear head and focus; creativity, silliness, talkativeness and heightened arousal are also mentioned.

Not everyone finds the strain light. Individual reports describe, alongside the head effect, a heaviness in the legs to the point of reluctance to move, or an energy drop once the first effect fades. Dry mouth and dry eyes appear as side effects, as do paranoia, anxiety, nervousness and dizziness.

THC and CBD Content:

The THC figures in strain descriptions vary widely: one gives 18 %, a second 8 to 19.5 %, a third 16 to 25 %. One description puts the CBD content at 0 %, another at under 1 %.

Cultivation:

For indoor cultivation, Next Generation Seed Company states 8 to 9 weeks of flowering; outdoors, according to the breeder, the plants are ready for harvest from mid to late October. Another strain description arrives at 65 days indoors and late October outdoors, and speaks of high yields under ideal conditions. The breeder itself describes a sturdy, robust plant that is not among the largest but still yields well.

An indoor grow documented in 2009 ran under a 600 W sodium vapor lamp after roughly 2 weeks of growth phase. The grower considered the flowering time of 50 days given by the vendor too short, expected 9 to 10 weeks and, due to external circumstances, harvested after 9 weeks, when the trichomes were still mostly clear to milky.

Versions from Different Breeders:

Next Generation Seed Company lists Grapefruit Haze exclusively as regular seed. Under the same name, a grower documented in 2024 the cultivation of an autoflowering variant from Quebec Cannabis Seeds; whether it traces back to the original breeder's cross is left open in the report.

This article is for informational purposes only and is not a substitute for medical or therapeutic advice. If you have any health-related questions, please consult a doctor or another qualified professional.

Effects & aroma

From reviews and experience reports — subjective, not a medical statement

Reported as positive
hungry
focused
energetic
Reported side effects
dizzy
anxious
paranoid
Aroma & flavor
Herbs Spicy Sour

No reviews yet — information from the strain description. Rate the strain to see shares.

Cannabinoids & terpenes

Levels vary by batch, phenotype and cultivation — values are indicative

THC
8–25 %
0 %35 %
CBD
0 %
0 %20 %
Terpene profile
  • #1
    MyrceneHerbs
  • #2
    CaryophyllenePepper
  • #2
    PinenePine
  • #3
    LimoneneCitrus
  • #4
    HumuleneHops

Cultivation

Indicative values from breeder data and grow reports — varies by phenotype and setup

Flowering & harvest
Breeder data
Flowering time
8–9 weeks
Outdoor harvest
mid to late October · Northern hemisphere
Yield & height
Yield level
High
Difficulty, environment & climate
Breeder data
Indoor
suitable
Outdoor
suitable
Morphology

According to the breeder, a very sturdy, robust plant, not the largest, with a good yield.

Genetics & origin

Origin
Cross
Super Silver Haze × BC Grapefruit (F4)
Origin
KA
Type
Sativa-dominant
Available as seeds
Regular, Autoflowering
Flowering types (all versions)
Photoperiod, Autoflowering
Original breeder
Next Generation Seed Company
Awards
  • The Karma Cup (Toronto) 2018Bud – Sativa · 3rd place
  • The Karma Cup (Toronto) 2018Bud – Sativa · 3rd place

Versions by different breeders

Several breeders sell their own versions under this name. Each figure comes from the respective breeder.

Next Generation Seed CompanyGrapefruit Haze
Original
PhotoperiodRegular
Flowering
8–9 weeks

Details from the section with breeder information on Seedfinder; no separate breeder website was found. Outdoor harvest mid to late October; according to the breeder a very sturdy, robust plant, not the largest, with a good yield; regular only, never feminized. The breeder overview on Seedfinder gives 60 days of flowering.

Quebec Cannabis SeedsAutoflower Grapefruit Haze
Relation unclear
AutofloweringAutoflowering

Documented only by a grow report from 2024; breeder page not opened, parentage unknown.

Community

36 grow and experience reports reviewed Community reports
Consensus

Energizing, mood-lifting, cerebral-leaning effect with a clear head and focus; aroma and flavor of grapefruit, in some cases peppery.

Divergent reports

Individual reports describe physical heaviness to the point of reluctance to move, or an energy drop after the first effect; some mention lavender, sour or earthy notes, harsh smoke or an unpleasant smell; side effects such as paranoia, anxiety and nervousness.

Reported values from individual grows
Flowering time in a grow report (grower's estimate)
9–10 weeks
Harvest time in a grow report
9 weeks of flowering
Vendor's flowering time figure rated too short by the grower
50 days
Growth phase in a grow report
2 weeks
Wattage of the sodium vapor lamp in a grow report
600 W

Grow diaries with this strain

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Similar strains

Related genetics, same dominant terpene, similar effects and aroma — excluding direct parents and descendants

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