Written by Ad OpsHistory of Amnesia Fast
Amnesia Fast is a modern response to a classic problem: the famously long bloom time of Amnesia and Amnesia Haze. Advanced Seeds in Spain created this fast-flowering photoperiod variant to deliver the same cerebral, citrus-forward character in a shorter, grower-friendly window. The variety appeared alongside a broader industry trend toward "fast versions," which blend photoperiod vigor with accelerated floral maturation. Retail listings place it in dedicated fast-flowering catalog categories and even curated mixes for relaxation, underscoring how quickly it resonated with home and craft growers.
While Amnesia Haze often demands 10–12 weeks of flowering, Amnesia Fast typically shortens the finish by roughly 10–30%. In practical terms, that can mean a 6–8 week indoor bloom, depending on phenotype and environment. This time savings is significant for cultivators in temperate climates, where October rains can threaten late-finishing sativas. By reaching ripeness earlier, Amnesia Fast improves the odds of a clean, mold-free harvest.
The concept of a "fast" photoperiod line matured in the 2010s as breeders refined methods to capture early-flowering genetics without sacrificing potency or turning the line fully auto. Advanced Seeds leaned into this paradigm, targeting reliable vigor and sativa-forward effects. Seed banks categorize Amnesia Fast alongside other quick photoperiods, often noting its "heavy-hitting" impact despite the shortened bloom. This framing highlights the project’s goal: speed without compromise.
Public-facing product pages and seed bank indexes routinely reference Amnesia Fast next to other Amnesia-family derivatives, positioning it as a direct answer to the long-cycle haze dilemma. Mentions on multi-brand retailers and sitemap indexes confirm its recognition across the market. It also appears in relaxation-focused seed mixes, indicating confidence in its mood-elevating, calming properties. Together, these signals show Amnesia Fast has earned a spot among quick, high-energy sativas for gardeners who prize both quality and efficiency.
Genetic Lineage and Breeding Strategy
Amnesia Fast descends from the Amnesia/Amnesia Haze family, a lineage famous for zingy citrus, incense, and a clear-headed, high-octane lift. The "fast" designation typically comes from introducing an early-flowering donor into a photoperiod line and then stabilizing away the autoflowering trait. Breeders often achieve this by crossing a haze mother with an early-flowering progenitor, then backcrossing to retain photoperiod behavior while preserving the shorter bloom window. The result is not an autoflower, but a photoperiod cultivar that finishes meaningfully sooner than its haze parent.
Advanced Seeds lists the variety as feminized and mostly sativa, aligning with the dominant haze architecture and effect. Though breeders rarely disclose exact donor lines, the statistical outcome is clear: reduced flowering time with minimal loss of the classic Amnesia profile. In practice, phenotypes tend to express 70–80% sativa traits in morphology and effect. Growers recognize this in the plant’s upright stance, internodal spacing, and classic haze terpene spectrum.
The breeding objective was multi-factor: preserve the hallmark Amnesia lift, maintain resin production, and trim roughly 1–3 weeks off bloom. Achieving all three requires careful selection across multiple filial generations, particularly screening for photoperiod fidelity. Stabilization also targets floral density and calyx-to-leaf ratio, so the plant trims and cures well. The consistency seen in retail grow diaries suggests the line has reached a reliable level of uniformity for home growers.
Within the broader haze ecosystem, Amnesia Fast occupies the middle ground between long-bloom sativas and full autos. Compared to the original Amnesia Haze’s 70–84 days, many Amnesia Fast phenos report 42–56 days of indoor flowering. This is a substantial 20–40% reduction depending on the starting reference. That shift not only accelerates cycles but also lowers the risk window for pests and botrytis late in flower.
Morphology and Appearance
Amnesia Fast grows with a sativa-forward posture: upright main stems, moderate to long internodes, and a tendency to form elongated, spear-shaped colas. Leaves are typically narrow and serrated, with lime to mid-green tones under adequate nitrogen. Under strong lighting, the canopy fills with lateral spears, often creating a uniform, screen-friendly top. The plant’s calyx-to-leaf ratio is above average, making for easier trimming compared to broader-leafed indica hybrids.
As flowers mature, pistils shift from cream to bright orange, then to deeper amber as trichomes peak. The trichome coverage is abundant, producing a frosted sheen that signals resin richness. Under magnification, heads transition from mostly clear to cloudy, with a smaller percentage turning amber as harvest approaches. This visual arc mirrors common sativa-dominant resin development patterns.
Buds are long and somewhat open early on, then pack on additional mass in the final two weeks. Even so, the structure generally remains less dense than heavy indica blocks, aiding airflow through the cola. The reduced density, combined with faster finishing, helps lower the incidence of gray mold in humid climates. In cured jars, buds retain an elegant, tapering silhouette that’s unmistakably haze-derived.
Height varies by environment, but indoor plants commonly reach 80–140 cm with training, while outdoor specimens can stretch to 180–250 cm. Expect a 1.5–2.0× stretch during the initial 2–3 weeks of bloom when light and nutrients are balanced. This predictable stretch profile suits SCROG and other canopy-management techniques. The end show is classic sativa: tall, sparkling colas with citrus-sweet aromas rising from the resin.
Aroma and Bouquet
The nose on Amnesia Fast is vibrant and layered, anchored by citrus-zest brightness and incense-like haze. Lemon and sweet orange top notes arrive first, supported by hints of lime pith and grapefruit rind. Mid-tones bring cedar, fresh herbs, and a whisper of floral sweetness, sometimes edging toward chamomile. In some phenotypes, a subtle metallic haze character or earthy spice adds complexity.
As the flowers cure, the bouquet deepens and smooths, with the sharper citrus elements merging into sweet-tart candy impressions. Many users describe a classic "clean yet heady" haze perfume that fills a room within seconds of opening a jar. Under careful curing at 58–62% relative humidity, the profile stabilizes and gains longevity. Over-drying, by contrast, emphasizes sharper pith and can mute the incense quality.
Terpenes likely driving this profile include terpinolene for the sweet, fresh, and piney-citrus lift. Limonene contributes zesty lemon-orange facets, while myrcene grounds the blend with herbaceous warmth. Beta-caryophyllene and ocimene often appear as subtle spicy and floral threads that round out the nose. Collectively, the bouquet reads quintessential haze with a modern, fruit-forward polish.
Retailers often highlight the aroma as a key selling point alongside the faster finishing time. Fast-version listings call out "heavy-hitting" potency and haze-forward character, reflecting the sensory intensity. In practice, that means jars that punch above their weight in both freshness and diffusion. It’s the kind of aroma that telegraphs energetic effects before the first inhale.
Flavor and Palate
On the palate, Amnesia Fast tracks its aroma closely, delivering lemon-zest brightness and sweet citrus oil. The top notes hit quickly, with lime and candied orange peel leading the charge. As vapor or smoke rolls across the tongue, subtle pine and herbaceous tea notes emerge. A faint white-pepper tickle at the back of the throat is common with haze-leaning lines.
Exhale is clean and lingering, leaving a sweet-citrus echo and a soft incense aftertone. When well-cured, the finish is smooth, avoiding the harshness sometimes associated with ultra-terpinolene profiles. Temperature control during vaporization preserves the limonene-driven zest, shining between 175–190°C for most devices. Combustion leans spicier and drier but still holds onto the citrus core.
Pairing-wise, Amnesia Fast sits well with sparkling water, citrus-forward cocktails, or herbal teas like lemongrass and mint. In edibles or rosin, it can skew toward lemon-candy and fresh-herb expressions. Similar results appear in solventless extracts where the brightness and incense character remain intact. Overall, the flavor signature is modern, crisp, and unmistakably haze.
The strain’s reduced flowering period does not appear to diminish flavor intensity when plants are finished properly. In fact, some growers report better terp retention due to earlier harvests that avoid late-season heat spikes. Proper dry and cure practices lock in the volatile citrus top notes. In the jar or on the palate, the profile is confident and persistent.
Cannabinoid Profile
While exact lab values vary by phenotype and cultivation method, Amnesia Fast is generally considered high in THC with minimal CBD. Reports from haze-family comparables place THC commonly in the 18–22% range, with some phenotypes capable of exceeding 22% under optimal conditions. CBD typically remains below 1%, and often under 0.2% in haze-derived lines. Minor cannabinoids such as CBG may appear around 0.3–0.8%, based on patterns seen in sativa-dominant hybrids.
This profile aligns with its perceived "heavy-hitting" nature in fast-seed listings and user reports. High THC correlates with strong psychoactivity, especially when paired with terpinolene and limonene. The low CBD means fewer moderating effects on THC’s intensity, so the experience can feel swift and cerebral. Newer consumers often do best with cautious titration.
Decarboxylation efficiency and curing practices will influence measured totals. For example, THCA converts to THC at rates affected by temperature and time, and excessive heat can convert THC to CBN. Properly cured flowers commonly retain robust THCA while minimizing degradative losses, sustaining potency in long-term storage. Airtight jars, cool temperatures, and darkness support stability across months.
In concentrate form, Amnesia Fast can achieve far higher THC percentages through extraction, often 60–80% total cannabinoids depending on method. Terp retention varies by technique, with solventless methods often preserving more delicate top notes. Regardless of form, the strain’s profile emphasizes clarity, energy, and intensity. Users should adjust dose size and route accordingly to match their tolerance and context.
Terpene Profile
Amnesia Fast typically expresses a terpene spectrum dominated by terpinolene, limonene, and myrcene, complemented by beta-caryophyllene, ocimene, and pinene. Total terpene content in well-grown haze-dominant flowers commonly ranges from 1.5–3.0% by weight. Within that, terpinolene can span roughly 0.4–1.2%, limonene 0.2–0.6%, and myrcene 0.3–0.8%. Caryophyllene, ocimene, and pinene often register in the 0.1–0.4% band each, shaping spice, floral, and pine facets.
Terpinolene is key to the fresh, airy, citrus-pine quality people associate with classic haze. Limonene adds bright lemon and sweet orange, a signature the palate recognizes quickly. Myrcene helps stitch together top notes with a softer herbal cushion, avoiding a hollow, overly sharp profile. Caryophyllene’s pepper snap and ocimene’s floral lift finish the blend.
This terpene matrix often correlates with alert, euphoric, and sociable moods in user reports. Although terpenes do not determine effects alone, their synergy with THC appears to steer the experience toward clarity rather than sedation. It is the opposite of myrcene-heavy, couch-lock indica profiles, matching real-world feedback. Many users favor it for daytime sessions or creative tasks.
From a cultivation perspective, protecting volatile monoterpenes like limonene and terpinolene requires careful handling. Gentle drying at 18–21°C with 50–60% RH helps preserve the top end. Curing in the 58–62% RH band locks in the bouquet and extends the shelf life. Avoiding excess heat and light exposure prevents terpene oxidation and flavor loss.
Experiential Effects
Amnesia Fast is often described as fast in more ways than one, with a quick-onset, head-forward euphoria. Inhalation can bring effects within 2–5 minutes, peaking around 30–45 minutes, and sustaining for 2–3 hours for many users. The psychoactive character trends toward uplift, focus, and a buzzing sense of motivation. It is a classic haze-style, energetic ride that stays crisp rather than woozy.
At moderate doses, many people report improved sociability and a brighter mood, with sensory detail seeming more vivid. Creative activities can feel more fluid as divergent thinking opens up. Physical energy tends to rise slightly, though it’s not an athletic stimulant. At higher doses, the speed and intensity can feel racy for those sensitive to THC.
Side effects include dry mouth and dry eyes, commonly reported across high-THC sativas. In susceptible users, rapid onset and high potency can produce transient anxiety or a fluttery heart feel. Keeping doses modest early on is a practical way to test one’s tolerance. Snacks, hydration, and a calm environment can reduce edginess.
The overall profile supports daytime and early-evening use, especially where focus and a positive tone are desirable. Users often select it for creative work sprints, light social gatherings, or mood-elevating breaks. Those seeking sleep may find it too stimulating close to bedtime. The experience tracks the sativa-majority genetics closely, delivering clarity over sedation.
Potential Medical Uses
Nothing here constitutes medical advice, but user patterns and emerging evidence suggest several possible applications. The mood-elevating, energizing profile may be appealing to adults managing low mood, anhedonia, or daytime fatigue. Observational surveys in legal markets consistently report high-THC, citrus-terpene cultivars being chosen for stress relief and mood support. The uplifting character of Amnesia Fast aligns with those preferences.
Some individuals use haze-lineage strains for focus during tasks that benefit from alertness. While data remain early, anecdotal reports describe improved engagement in creative or routine activities. Limonene-rich chemotypes are associated with bright affect in user feedback, which may contribute to this selection. However, responses vary widely, and high THC can be distracting for some.
Pain and headache relief are commonly cited reasons adults try sativa-dominant strains. THC’s analgesic and antiemetic properties are documented, though responses are dose-dependent and context-specific. For neuropathic pain, some users prefer daytime sativas to avoid sedation at work. In contrast, those needing muscle relaxation may prefer an indica-leaning option instead.
Potential drawbacks include increased anxiety or heart rate in sensitive populations, especially at higher doses. People with anxiety disorders may prefer lower doses or balanced THC:CBD options. Dry mouth, dry eyes, and transient dizziness are typical, self-limited effects. Always consult local laws and a qualified clinician where applicable, especially if combining cannabis with other medications.
Comprehensive Cultivation Guide
Legal note: Cultivate cannabis only where permitted, and comply with all applicable laws. The following is general horticultural information for legally compliant growers. Amnesia Fast is a feminized, photoperiod, mostly sativa cultivar bred by Advanced Seeds. Its defining trait is a shortened flowering period compared with classic Amnesia/Amnesia Haze, while retaining energetic haze character.
Growth habit and vigor: Expect upright, sativa-forward structure with 1.5–2.0× stretch during the first 2–3 weeks of bloom. Indoor plant height generally ranges 80–140 cm with training; outdoors, 180–250 cm is common. Nodes are moderately spaced, so early canopy control is helpful to keep tops even. The calyx-to-leaf ratio is favorable, simplifying trimming after harvest.
Flowering time and harvest window: Indoors, many phenotypes complete in about 6–8 weeks of flowering, a 10–30% reduction vs. long-bloom hazes. Outdoors in the Northern Hemisphere, early to mid-September finishes are achievable in warm climates; late September at higher latitudes. This earlier window reduces exposure to autumn rain, lowering botrytis pressure. Trichome observation—transition from clear to mostly cloudy with some amber—remains the most reliable harvest cue.
Yield potential: Indoor yields commonly land in the 450–550 g/m² range under optimized conditions. Outdoor yields vary more widely but 600–900 g per plant is attainable in favorable climates with ample root volume and sun. While sativa buds are less dense than indica blocks, the total cola length can be substantial, making SCROG and trellising effective. Faster finishing can modestly improve annual output by enabling more cycles indoors.
Environment and lighting: In veg, target 22–28°C with 55–70% RH; in flower, 20–26°C with 40–60% RH to protect trichomes and reduce mold risk. Steady airflow and clean intake filtration are valuable given the elongated cola structure. For photosynthetic intensity, many growers aim for 600–900 µmol/m²/s PPFD in mid-flower, tapering or maintaining based on cultivar response. DLI between 35–45 mol/m²/day supports robust flowering without undue stress for most phenotypes.
Media and nutrition: Amnesia Fast performs well in quality soil, coco, or hydroponic setups. In soilless or hydro, pH 5.7–6.2 is typical; in soil, 6.2–6.8 supports nutrient availability. Nutrient strength trends moderate, with many cultivators finding success around 1.2–1.8 mS/cm EC depending on stage and cultivar appetite. Maintain a balanced approach to nitrogen in veg, then increase phosphorus and potassium moderately in bloom without overloading late.
Training and canopy management: Topping once or twice and applying low-stress training can create a broad, even canopy. Screen of Green (SCROG) is especially effective to capture the long cola potential and maximize light interception. Defoliation should be measured—remove large fan leaves that block key sites, but preserve enough foliage for strong metabolism. Sturdy stakes or trellis netting prevent spear-shaped colas from bending as weight builds.
Watering and root health: Aim for consistent wet–dry cycles appropriate to your media, avoiding chronic saturation that invites root pathogens. Moderate dry-backs encourage deeper root exploration and oxygenation. Adding silica during veg and early bloom can improve stem rigidity, beneficial for long sativa colas. Keep irrigation solution temperatures near 18–22°C to support root performance.
Pest and disease management: The faster finish helps reduce late-season botrytis risk, but good airflow and RH control remain essential. Spider mites and thrips are the most common pests in indoor environments—monitor leaves underside and deploy preventative IPM such as sticky cards and periodic scouting. Beneficial insects or biologicals can be integrated proactively in greenhouses. Sanitation between cycles materially lowers infestation odds.
Aroma control and curing: As harvest nears, the citrus-incense aroma intensifies and can be conspicuous, so carbon filtration is recommended indoors. Dry in 18–21°C, 50–60% RH with gentle airflow until stems snap rather than bend, typically 7–12 days depending on bud size. Cure in airtight containers at 58–62% RH, burping periodically during the first 10–14 days. A 3–6 week cure consolidates flavor, and total terpene retention often improves when the earlier harvest avoids late heat spikes.
Phenotype notes: The majority of plants will lean haze in nose and effect, but there can be variance in density and terp dominance. Terpinolene-forward phenos usually present the most "classic" Amnesia experience. A minority may skew toward limonene-caryophyllene, tasting zestier and spicier with slightly more compact buds. Selecting and preserving standout cuts can lock in your preferred expression across cycles.
Compliance and sourcing: Amnesia Fast is widely listed by reputable retailers in the "Fast Version" category and as part of relaxation-oriented mixes, reflecting confidence in its effects profile. It is bred by Advanced Seeds and sold as a feminized photoperiod variety, not an autoflower, which is important for scheduling and light planning. Always verify seed authenticity and storage conditions to protect germination rates. Above all, ensure cultivation plans align with local regulations to remain compliant.
