Sativa Dominant · Green House Seed Co.
Amnesia Haze
Amnesia Haze is the Soma Seeds and Green House cross released in the early 2000s, bringing together a Jamaican landrace, a Hawaiian sativa, and a Southeast Asian Thai with a small Afghani contribution. The strain took first place at the High Times Cannabis Cup in 2004 and has remained one of the most ordered sativas in Amsterdam coffeeshops ever since. Plants stretch hard, take ten to eleven weeks to finish, and reward growers who can manage tall canopies and long flowering windows. The high is strongly cerebral — bordering on psychedelic in some phenotypes — with a fast onset and a long, energetic tail.
Reviewed 2026-05-23· Sources: seedfinder.eu, Green House catalogue, Soma Seeds notes, Cannabis Cup archive
Potency
- THC range
- 20–25%
- Typical THC
- 22%
- CBD
- up to 0.1%
Flowering
- Indoor weeks
- 10–11 wk
- Difficulty
- Hard
- Climate
- Mediterranean, warm dry
Yield & size
- Indoor
- 550-650 g/m²
- Outdoor
- 600-800 g/plant
- Height
- 150-200 cm
Indica / sativa ratio
Terpene profile
The aromatic compounds below shape how Amnesia Haze smells, tastes, and ultimately feels in the body.
- dominant
Myrcene
Sedating, musky, herbal — commonly linked to couch-lock effects.
- secondary
Pinene
Alert and pine-forward — associated with mental clarity and bronchodilation.
- secondary
Caryophyllene
Peppery and spicy — the only terpene that binds CB2 receptors, studied for anti-inflammatory action.
- minor
Limonene
Uplifting citrus — typically associated with mood elevation and stress relief.
Reported side effects
Lineage
Amnesia Haze traces to Jamaican × Hawaiian × Thai × Afghani. The cross sits in the Haze family, which influences both the terpene profile and the flowering structure described above.
Genetic family tree
Documented parents for Amnesia Haze based on breeder catalogues. Library entries are clickable; ancestors not yet documented on this site appear in a lighter, non-linked box.
Strains crossed with Amnesia Haze
Amnesia Haze is a parent of 3 strains in the broader catalogue. These are crosses that carry Amnesia Haze genetics on at least one side of the cross.
Grow profile
Grow profile
- Indica / sativa
- 20% / 80%
- Flowering days
- 70–77 days
- Stretch
- High
- Pest resistance
- High
- Mold resistance
- Moderate
- Training methods
- topping, scrog, supercropping
Feed schedule for Amnesia Haze
These EC and NPK targets are starting points calibrated for the strain's Sativa lean and hard difficulty rating — not gospel. Drop 15-20% off any EC ceiling on your first run and let the plant tell you where it actually wants to feed.
Suggested feed schedule
- Late veg
- 1.5-1.7 EC
- Early flower
- 1.6-1.8 EC, NPK 2-2-3
- Mid flower
- 1.9-2.1 EC, NPK 1-3-4
- Late flower
- 1.7-1.9 EC
- Final week
- Aggressive water flush at 6.2-6.5 pH for the last 7-10 days to clear salts.
Full breakdown of feed math, runoff testing, and salt buildup in our nutrient guide.
What to expect through the grow cycle
Amnesia Haze is documented with a 11-week flower and a longer stretch phase typical of sativa-leaning hybrids. The visual below maps a documented 15-week cycle built from 4weeks of vegetative growth and the strain's published flowering window.
Published grow reports for Amnesia Haze concentrate the most observational notes on the stretch window. This timeline is descriptive — it reflects what reports document, not a how-to. Actual week-to-week behaviour varies with phenotype, light intensity, pot size, and environment.
Phase details
- Veg (weeks 1-4)
- The documented vegetative period for Amnesia Haze. Plants establish root structure, leaf canopy, and node count before flower triggering, with a hard difficulty rating shaping how forgiving the early canopy work tends to be.
- Stretch (weeks 5-8)
- Amnesia Haze is documented as having high stretch. Reports describe the plant roughly doubling in height during this phase as the sativa-leaning structure establishes its final flowering frame.
- Bud sites (weeks 9-10)
- Pre-flowers form at the nodes and calyxes begin to develop. Grow reports for Amnesia Hazenote this as the window where the canopy's eventual bud distribution becomes visible.
- Bud development (weeks 11-13)
- Flowers thicken and calyxes fatten through this phase. Documented Amnesia Haze runs show the bulk of visible flower mass accumulating here, with resin production accelerating toward the end.
- Ripening (week 14)
- Trichomes transition from clear toward cloudy and amber. Reports for Amnesia Haze describe the Myrcene-led terpene profile maturing through this window, with aroma sharpening week over week.
- Final (week 15)
- Calyx swelling is documented as complete and the harvest window opens. Published Amnesia Haze runs end here, within the 10-11 week flowering range reported by the breeder.
Flavor & aroma
Reported effects
Awards
- 2004 · High Times Cannabis Cup — 1st (Sativa)
- 2012 · High Times Cannabis Cup — 1st (Sativa)
Common questions about Amnesia Haze
Why is Amnesia Haze considered hard to grow?
It takes ten to eleven weeks of flower, stretches more than two times its veg height, and needs careful nutrient management to avoid late-flower deficiencies. It is not a first-grow strain.
Can Amnesia Haze cause anxiety?
The cerebral high is intense enough that high doses can tip into racing-heart anxiety, especially in users with low THC tolerance. Microdosing is the standard recommendation for new users.
Breeder of record
Green House Seed Co.
View breeder profile and other strains →
More from Green House Seed Co.
Strains similar to Amnesia Haze
These picks lean on the same terpene profile and parent genetics as Amnesia Haze — shared dominant terps, overlapping lineage, and matching indica/sativa lean. No star ratings or popularity contests, just overlap on the traits that actually drive a similar grow and smoke.