Amnesia is a sativa-dominant feminized photoperiod strain from Green House Seed Co., created from Super Silver Haze and Afghan genetics. This specific seed line is 65% Sativa and 35% Indica, with 25% THC and an indoor flowering period of approximately 9–10 weeks.
White Widow genetics carry a sativa lift alongside their heavy resin, which is part of their lasting appeal. Our White Widow is a faithful feminized version, while Dutch Passion’s White Widow x The Ultimate is a potent regular cross for breeders and purists. Both deliver the trichome-heavy, well-balanced effect the strain is known for.
Recommended Strains
Amnesia Seeds
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THC | 25% - 26% (High) |
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Lineage | Super Silver Haze x Afghan |
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Type | Feminized |
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Height | 6.07 ft | 1.85 m |
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Yield Outdoor | 31.75 oz/plant | 900 g/plant |
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Flowering Time | 10 - 11 weeks |
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Phenotype | 35% Indica / 65% Sativa |
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Effects | Balanced, Powerful, Relaxed |
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Flavors | Lemon, Nutty |
Amnesia Dream XL Auto
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THC | 17% - 18% (Medium) |
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Lineage | Amnesia Auto x Amnesia Haze |
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Type | Autoflowering |
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Height | 4.27 ft | 1.3 m |
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Yield | Medium |
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Yield Indoor | 1.15 - 1.31 oz/ft² | 350 - 400 g/m² |
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Yield Outdoor | 7.05 - 10.58 oz/plant | 200 - 300 g/plant |
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Life Cycle | 10 - 11 weeks |
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Phenotype | 30% Indica / 70% Sativa |
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Effects | Energetic |
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Flavors | Citrus, Earthy |
Growlantis carries GH Amnesia seeds, a vigorous strain known for strong lateral branching, compact internodes and substantial production potential. Indoors, the breeder lists yields of up to 900 g/m², while outdoor plants can reach approximately 170–200 cm and produce around 700 g per plant under favorable conditions.
| Amnesia Grow Info | Verified specification |
|---|---|
| Breeder | Green House Seed Co. |
| Genetics | Super Silver Haze × Afghan |
| Seed type | Feminized photoperiod |
| Sativa / Indica | 65% Sativa / 35% Indica |
| THC | 25% |
| CBD | 0.20% |
| Flowering time | 9–10 weeks |
| Indoor height | No exact current breeder figure published |
| Outdoor height | 170–200 cm |
| Indoor yield | Up to 900 g/m² |
| Outdoor yield | Around 700 g/plant |
| Outdoor harvest | Late September to mid-October |
| Structure | Vigorous, strong lateral branching, compact internodes |
| Flavor and aroma | Lemon, citrus, creamy, light nutty/Haze notes |
Amnesia Genetics
GH Amnesia combines Super Silver Haze with Afghan genetics. The resulting plant retains a clear sativa dominance while adding structural characteristics that make the plant more manageable and productive than many highly elongated Haze-type cultivars.
This version is bred by Green House Seed Co. Growers interested in comparing it with other genetics from the same breeder can browse the Green House Seed Co. collection at Growlantis.
GH Amnesia is photoperiodic. It does not begin flowering automatically after a fixed number of weeks, so indoor growers determine the length of the vegetative phase and then initiate flowering by changing the light schedule.
Is Amnesia Sativa or Indica?
GH Amnesia is 65% Sativa and 35% Indica, making it a clearly sativa-dominant hybrid rather than a balanced 50/50 strain.
Its growth reflects that classification through vigorous development and considerable outdoor height, but its structure is not simply that of a very loose, extremely stretched pure sativa. The breeder describes strong lateral branches, relatively compact internodal spacing and a pine-tree-like flowering structure capable of supporting substantial flower development.
The Sativa/Indica ratio describes the breeder’s genetic classification of this particular seed line. It should not be used as a guarantee that every plant will have identical morphology or that every individual will experience its effects in exactly the same way.
How Much THC Does Amnesia Have?
The current Green House Seed Co. specification lists GH Amnesia at 25% THC, along with 0.20% CBD and 0.13% CBN.
The breeder describes its effects as arriving quickly and combining cerebral and physical characteristics with an uplifting Sativa influence before developing into a more relaxing experience. Individual response can still vary according to dose, tolerance and the chemical composition of the harvested flowers.
Older listings and other cultivars carrying the Amnesia name may show different THC percentages. Those figures should not be combined with this seed line, particularly because Amnesia Haze and autoflowering Amnesia cultivars have different genetics and specifications.
Amnesia Flavor and Aroma
GH Amnesia has a strong citrus-led aromatic profile. Green House Seed Co. describes intense lemon notes combined with a creamy quality reminiscent of freshly pressed olive oil, followed by lighter nutty and Haze-like characteristics.
The aroma becomes particularly noticeable as the flowers develop and mature. Rather than assigning a fixed terpene hierarchy to the cultivar, these breeder-documented sensory characteristics provide the most reliable description of the current seed line.
Does Amnesia Have a Verified Terpene Profile?
Green House Seed Co. does not currently publish a detailed quantitative terpene analysis for GH Amnesia on its main strain specification page. For that reason, limonene, myrcene, caryophyllene or other individual compounds should not be presented as a definitive dominant-terpene list without analytical data for the exact seed line.
The verified information is its pronounced citrus and lemon character, creamy notes and lighter nutty/Haze qualities. Phenotype and growing conditions can also influence how strongly those characteristics are expressed.
How Long Does Amnesia Take to Flower?
GH Amnesia has an indoor flowering period of approximately 9–10 weeks. This figure refers specifically to the flowering stage and should not be confused with the complete period from germination to harvest.
Because Amnesia is photoperiodic, indoor growers control the length of vegetative growth. A plant can therefore have a relatively short or much longer total cultivation time depending on how long it remains in vegetation before the flowering light schedule begins.
Once the desired plant structure and canopy size have developed, indoor growers can transition to a flowering photoperiod such as 12 hours of light followed by 12 hours of uninterrupted darkness. From that point, the breeder’s 9–10 week flowering range becomes the main timing reference.
Amnesia Height and Plant Structure
Green House Seed Co. currently lists an average outdoor height of 170–200 cm. The breeder does not provide an exact current indoor height range, so an outdoor figure should not be reused as though it applies universally to indoor plants.
GH Amnesia develops vigorously and produces strong lateral branches capable of carrying substantial flower weight. During flowering, its relatively compact internodal spacing creates numerous flowering sites along a pine-tree-like structure rather than producing only a few widely separated colas.
For indoor growers, the absence of a fixed breeder height makes vegetative duration and canopy management especially important. Plant size should be controlled according to the actual available space rather than an assumed final height.
Growing Amnesia Indoors
Indoor Amnesia cultivation should be planned around its vigorous growth and high production potential. Green House Seed Co. lists yields of up to 900 g/m², although this should be understood as potential performance under favorable conditions rather than a guaranteed harvest.
Because the plant is photoperiodic, the grower can limit its final size by controlling vegetative duration. Growers with restricted vertical space should establish their canopy before the plant becomes difficult to contain, rather than waiting until flowering stretch has already occurred.
Strong lateral branching creates useful opportunities for spreading growth across the available footprint. The goal is not to force every plant into one specific training system, but to avoid an excessively tall or congested canopy while preserving enough healthy foliage to support flowering.
Growing Amnesia Outdoors
GH Amnesia reaches approximately 170–200 cm outdoors, where the breeder lists production of around 700 g per plant. Its vigorous branching means plants need enough lateral space as well as vertical clearance, particularly when grown through a long vegetative season.
Green House Seed Co. reports outdoor harvest from late September to mid-October. Local latitude, seasonal temperatures and weather can influence the exact maturation date, so this range should be used as a planning window rather than a mandatory harvest date.
The breeder also reports strong resistance to mold, fungus and pest infections, which is particularly useful outdoors. Resistance does not mean immunity, however. Dense flowers, prolonged rain or stagnant sections of the canopy can still create conditions where disease develops.
Amnesia Yield
Amnesia has unusually strong published yield potential for this seed line. Indoors, Green House Seed Co. lists production of up to 900 g/m², while outdoor plants are listed at approximately 700 g per plant.
These figures use different units for an important reason. Indoor yield is expressed by canopy area because plant count, vegetative duration and training can vary substantially within one square meter. Outdoor yield is expressed per plant because individual plants can develop much larger root systems and canopies.
Neither figure is a guaranteed harvest. Light availability, plant health, root volume, environmental stability, vegetative development and overall cultivation management can all shift the final result.
How to Germinate Amnesia Seeds
GH Amnesia does not require a unique strain-specific germination technique. Seeds can be started using a controlled cannabis germination method that supplies consistent moisture and warmth while avoiding waterlogged conditions.
Once the root emerges, handle the germinated seed carefully and transfer it into an appropriate starting medium. At this stage, stable moisture matters more than heavy watering because a small root system cannot use the same amount of water as an established vegetative plant.
For detailed temperature and moisture guidance, see Growlantis’ cannabis seed germination temperature and humidity guide.
Vegetative Growth
The vegetative period of Amnesia has no fixed number of weeks. Indoor growers can keep the plant in vegetative growth until its size, root development and branching suit the intended flowering space.
Because GH Amnesia develops vigorously, this phase should be used to create a useful framework rather than simply allowing uncontrolled vertical growth. Strong side branches can become productive flowering sites later, so the plant lends itself to canopy management where space or light distribution makes it worthwhile.
A smaller indoor space may justify an earlier flowering transition, while growers using a larger room may allow considerably more vegetative development. The correct timing depends on the plant and the available space rather than a universal calendar.
Training Amnesia Plants
Low-stress branch positioning can help distribute GH Amnesia’s vigorous lateral growth across a wider canopy. This can be particularly useful indoors, where vertical clearance is limited and multiple productive branches need access to strong light.
Topping can also be used during vegetative growth when the plant is healthy and has adequate recovery time before flowering. A screen or other support structure can help organize a larger canopy, but no single technique is mandatory for the strain.
Later in flowering, support may become more important than continued training. Green House Seed Co. specifically describes heavy flowers developing on strong side branches, so stakes, ties or a support net can be useful if branches begin to bend under increasing flower weight.
Flowering Development
When the indoor light schedule changes to flowering, Amnesia begins the 9–10 week phase used in the breeder specification. Early flowering is a period of structural transition as vegetative growth slows and flower sites develop along the branches.
As flowering progresses, the cultivar forms increasingly compact flowers covered with visible trichomes. Its relatively close internodal spacing can create numerous flowering sites, making canopy spacing and air movement increasingly relevant as flower mass builds.
During the final part of the flowering period, use the breeder timeline as a reference rather than treating a particular day as an automatic harvest date. Plant maturity should still be assessed directly because environmental conditions and phenotype can produce some variation.
Feeding Amnesia
GH Amnesia does not require a universal strain-specific nutrient ratio. Feeding should instead be based on the cultivation medium, fertilizer system, water quality, root development, plant size and the actual response of the plant.
During vegetative growth, use a nutrient program appropriate for actively developing cannabis plants rather than assuming that increasingly strong fertilizer automatically creates faster growth. As flowering begins, follow the transition recommended by the fertilizer system instead of aggressively increasing phosphorus or potassium simply because flowers are forming.
Watch the plant for progressive deficiency symptoms, burned leaf tips, excessively dark foliage or stalled development. Adjustments are more useful when they respond to an identifiable problem than when nutrients are added automatically according to a generic strain calendar.
Watering Amnesia
Avoid watering Amnesia on a fixed schedule. A young plant with a small root system and an established flowering plant with a large canopy can have completely different water requirements even when they occupy the same environment.
In containers, substrate moisture and pot weight are more useful indicators than simply counting days between irrigation. Ensure that excess water can drain and avoid keeping the root zone continuously saturated.
Outdoor demand can rise substantially as a 170–200 cm plant develops a larger canopy, particularly during warm weather. Even then, watering should respond to root-zone conditions and weather rather than an inflexible daily volume.
Mold Resistance and Airflow
Green House Seed Co. describes GH Amnesia as highly resistant to common external cultivation problems, including mold, fungus and pest infections. This is a genuine breeder characteristic of the seed line, but it should be understood as resistance rather than immunity.
As the plant develops compact, heavy flowers, localized moisture can still become a problem if air remains stagnant within a dense canopy. Good spacing, removal of dead plant material and even circulation around flowering branches remain worthwhile preventive measures.
Common Problems When Growing Amnesia
One practical challenge with GH Amnesia is managing vigorous growth in restricted indoor space. Because the breeder does not publish one universal indoor height, growers should control plant size through vegetative timing and canopy management instead of relying on an assumed final measurement.
Overwatering and excessive feeding can also create avoidable problems. These are not unique sensitivities of Amnesia, but large plants can change their water and nutrient demand considerably as they develop, so an early-stage routine should not simply be maintained unchanged throughout the entire grow.
Late in flowering, continue inspecting dense flowers despite the strain’s reported mold resistance. A resistant cultivar can still encounter problems where moisture remains trapped or environmental conditions become unfavorable.
Amnesia vs Amnesia Haze
Amnesia and Amnesia Haze should not be treated as interchangeable names on Growlantis.
The GH Amnesia covered in this guide is a Green House Seed Co. photoperiod strain created from Super Silver Haze × Afghan, with 65% Sativa / 35% Indica genetics and a 9–10 week flowering period.
Growlantis also carries separate Amnesia Haze genetics with different parentage, cannabinoid levels, plant characteristics and cultivation timelines. If that is the cultivar you are growing, use the dedicated Amnesia Haze grow guide rather than transferring GH Amnesia specifications to another seed line.
When to Harvest Amnesia
Indoors, the published flowering window is 9–10 weeks after flowering begins. The complete seed-to-harvest period will be longer because vegetative duration is controlled by the grower.
Outdoors, Green House Seed Co. lists harvest from late September to mid-October. Seasonal conditions can move individual plants within that window, so growers should combine the breeder timing with direct observation of flower maturity.
Avoid relying on one fixed percentage of amber trichomes as a universal requirement for GH Amnesia. Trichome appearance can contribute useful information, but maturity should be assessed alongside the overall condition and development of the flowers.
Amnesia FAQs
Is Amnesia Indica or Sativa?
GH Amnesia is a sativa-dominant hybrid with 65% Sativa and 35% Indica genetics. Green House Seed Co. created this version from Super Silver Haze and Afghan. Its vigorous growth and outdoor height reflect its Sativa influence, while the Afghan side contributes to the structure of this specific photoperiod line.
How long does Amnesia take to flower?
GH Amnesia has an indoor flowering period of approximately 9–10 weeks. This figure covers flowering only, not the complete seed-to-harvest cycle. Because it is a photoperiod plant, indoor growers choose how long it remains in vegetative growth before changing the lighting schedule and beginning the flowering phase.
How much THC does Amnesia have?
Green House Seed Co. currently lists GH Amnesia at 25% THC, alongside 0.20% CBD and 0.13% CBN. Other cultivars using Amnesia in their names may publish different cannabinoid levels, so figures from Amnesia Haze, autoflowering Amnesia strains or unrelated seed lines should not be applied to this cultivar.
How much does Amnesia yield indoors?
The current breeder specification lists GH Amnesia at up to 900 g/m² indoors. This is production potential under favorable conditions rather than a guaranteed harvest. Light, usable canopy area, plant health, root development, vegetative duration and cultivation technique can all influence how closely an individual grow approaches that figure.
How much does Amnesia yield outdoors?
Green House Seed Co. lists outdoor GH Amnesia production at approximately 700 g per plant. Actual harvest weight depends heavily on sunlight, root space, growing-season length, weather, plant health and canopy development. The published figure should therefore be treated as breeder-listed yield potential rather than an expected result from every plant.
How tall does Amnesia grow?
Green House Seed Co. currently lists an average outdoor height of 170–200 cm for GH Amnesia. The breeder does not publish an exact current indoor height, so the outdoor figure should not be presented as a universal plant height. Indoor size depends heavily on vegetative duration, training and available space.
