How to Grow AMG: A Step-by-Step Guide

AMG, short for Amnesia Mac Ganja, is a sativa-dominant feminized strain from Royal Queen Seeds created by crossing Amnesia with Mexican Haze. The AMG strain combines a relatively manageable indoor height with a longer flowering period, substantial outdoor stretch, citrus-earthy flavors, and THC levels of up to 22%.

Royal Queen Seeds classifies AMG as 80% Sativa and 20% Indica. Indoors, plants typically reach 80–120 cm and flower for 65–70 days, while outdoor plants can grow to 140–200 cm and are normally ready for harvest during October.

Recommended Strains

Amg

	THC	22% - 23% (Medium)
	Lineage	Amnesia x Mexican Haze
	Type	Feminized
	Height	5.58 ft | 1.7 m
	Yield	High
	Yield Indoor	1.47 - 1.64 oz/ft² | 450 - 500 g/m²
	Yield Outdoor	19.4 - 21.16 oz/plant | 550 - 600 g/plant
	Flowering Time	10 - 11 weeks
	Phenotype	20% Indica / 80% Sativa
	Effects	Balanced, Focused, Relaxed
	Flavors	Citrus, Earthy

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3 Seeds - $395 Seeds - $59.50 Add to cart

El Patron

	THC	22% - 23% (Medium)
	Lineage	AMG x Shiva
	Type	Feminized
	Height	5.74 ft | 1.75 m
	Yield	High
	Yield Indoor	1.47 - 1.8 oz/ft² | 450 - 550 g/m²
	Yield Outdoor	19.4 - 21.16 oz/plant | 550 - 600 g/plant
	Flowering Time	9 - 10 weeks
	Phenotype	40% Indica / 60% Sativa
	Effects	Powerful, Relaxed
	Flavors	Herbal, Pepper

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3 Seeds - $41.505 Seeds - $63 Add to cart

You can find the feminized AMG seeds available at Growlantis.

AMG Quick Grow Profile

These specifications refer specifically to the AMG bred by Royal Queen Seeds.

AMG Genetics and Plant Structure

Amnesia Mac Ganja combines Amnesia with Mexican Haze, producing a strongly sativa-dominant cultivar with 80% Sativa and 20% Indica genetics. The influence of these parents is most evident in its extended flowering period, outdoor height potential, cerebral character, and preference for a sufficiently long growing season.

Despite its strong sativa dominance, AMG does not necessarily become excessively tall indoors. Royal Queen Seeds lists an indoor height of approximately 80–120 cm, making the plant more manageable than its genetic classification might suggest. Outdoors, however, unrestricted root space and a longer vegetative period can allow AMG to reach approximately 140–200 cm.

The difference between indoor and outdoor height is important when planning the grow. A single height figure does not accurately describe AMG in every environment. Indoor growers can control much of the final size through vegetative duration and canopy training, whereas outdoor specimens have more time and space to develop their natural structure.

Growing AMG Indoors

AMG can be grown successfully indoors despite its 80% Sativa background. Its breeder-listed height of 80–120 cm makes it suitable for many indoor spaces, provided the grower accounts for continued vertical development after flowering begins.

An 18/6 light schedule is a common option during vegetative growth. Once the canopy has reached an appropriate size for the available space, switching to 12 hours of light and 12 hours of uninterrupted darkness initiates flowering. Because AMG is photoperiod-dependent, there is no fixed vegetative duration that every plant needs to follow.

Growers with limited vertical space should avoid waiting until plants are already close to the lighting system before initiating bloom. The cultivar continues developing during its flowering transition, and earlier canopy management gives the grower considerably more control than trying to correct excessive height later.

Managing AMG Height and Branching

Training AMG is most useful when it solves an actual structural problem. If the main stem begins dominating the canopy, low-stress training can help spread growth horizontally and improve light exposure across several branches. Topping can also be performed during healthy vegetative growth when the goal is to encourage additional main growth points.

Techniques such as ScrOG can be particularly useful with a sativa-dominant plant because they allow longer branches to be distributed across the available canopy rather than growing primarily upward. The screen should create an open, evenly exposed structure rather than an excessively crowded mass of foliage.

Training should be largely completed before advanced flowering. Late, aggressive manipulation creates unnecessary stress and becomes increasingly difficult once branches begin supporting developed flowers.

Airflow and Canopy Management

As AMG progresses through flowering, maintaining an open canopy becomes more important. Overlapping leaves and branches can create small areas of stagnant air that are more humid than the rest of the grow room, particularly as flower density increases.

The aim is not to direct maximum fan power at the plants. A better approach combines sensible plant spacing, air exchange from the grow space, and gentle circulation above, below, and through the canopy.

Growers who want to examine this in more detail can use the Growlantis guide to cannabis airflow and mold prevention.

Growing AMG Outdoors

AMG has considerably more room to express its sativa-dominant structure outdoors. Royal Queen Seeds lists outdoor heights of approximately 140–200 cm and identifies long summers as the cultivar’s preferred climate.

That longer seasonal requirement deserves attention. AMG takes 65–70 days to flower indoors and is listed for an October outdoor harvest, so growers in regions where autumn becomes cold or persistently wet early in the season should consider whether local conditions provide enough time for the flowers to mature properly.

Choose an outdoor position with strong direct sunlight, adequate drainage, and enough lateral room for branches to develop. A plant approaching two meters can also become substantially wider than an indoor specimen, especially when given a long natural vegetative period and unrestricted root space.

Royal Queen Seeds lists outdoor production at approximately 550–600 g per plant under favorable conditions. This should be treated as breeder potential rather than a guaranteed harvest, since outdoor yield depends heavily on sunlight, root volume, climate, plant health, nutrition, water availability, and phenotype.

AMG Flowering Time

Royal Queen Seeds lists the AMG flowering time at 65–70 days, equivalent to approximately nine to ten weeks after indoor flowering has been initiated.

This is more precise than the conflicting 8–12 week ranges previously associated with the cultivar. The 65–70 day figure applies only to the flowering period; it does not include germination or vegetative growth.

During the first part of bloom, AMG can continue developing vertically while flowering sites become established. This transition period is when insufficient indoor headroom becomes most obvious, so growers should plan the canopy before switching to 12/12.

By mid-flowering, flower development and resin production become increasingly visible. During the final weeks, use the breeder timeline as a reference while evaluating the maturity of the actual plant rather than assuming every phenotype will be ready on exactly the same day.

For more detail on what changes throughout bloom, see the Growlantis guide to the cannabis flowering stage week by week.

AMG Yield Indoors and Outdoors

Royal Queen Seeds lists an indoor AMG yield of approximately 450–500 g/m². Outdoors, the breeder reports approximately 550–600 g per plant under favorable growing conditions.

These figures are useful for comparing the production potential of different genetics, but they should not be interpreted as guaranteed results. Indoor yield depends on canopy size, lighting, root volume, vegetative development, plant number, environment, feeding, and overall plant health.

The same principle applies outdoors. A healthy AMG plant grown in strong sunlight with substantial root space has very different production potential from one grown in a small container or a partially shaded position.

Rather than chasing a predetermined gram figure, growers should focus on developing a healthy canopy and maintaining stable conditions throughout the relatively long flowering stage.

Germinating AMG Seeds

AMG does not require a unique germination method. Stable warmth, consistent moisture, and gentle handling are more important than the cultivar name during this early stage.

The paper towel method is one option, although seeds can also be started in an appropriate propagation medium. The important point is to keep the environment consistently moist without leaving the seed permanently saturated, which can reduce oxygen around the developing root.

Once the root emerges, transfer the seed carefully and avoid touching or damaging the exposed root tip. Young seedlings should be allowed to establish their root system and first true leaves before being subjected to strong feeding or aggressive environmental changes.

For a complete explanation of timing and methods, see how long cannabis seeds take to germinate.

AMG Vegetative Growth

During vegetative growth, AMG develops the branches and root system that will later support flowering. An 18/6 light schedule is a practical indoor option, but the length of this stage should be determined by plant size and available space rather than an arbitrary number of weeks.

Because the cultivar can reach 80–120 cm indoors, growers working in lower spaces may choose a shorter vegetative period or begin low-stress training before the plant becomes difficult to manage. Growers with more vertical room can allow additional vegetative development before switching to 12/12.

This is also the best period for most structural training. Topping, branch positioning, or a ScrOG setup should be introduced while the plant is growing vigorously and still has time to recover before flowering becomes established.

Avoid assuming AMG needs a special strain-specific nutrient formula during this stage. Healthy vegetative nutrition should be based on the growing medium, water quality, nutrient system, and the actual response of the plant.

Feeding AMG

Royal Queen Seeds does not publish a mandatory AMG-specific NPK schedule requiring fixed ratios such as 3-1-2 during vegetation or 1-3-2 during flowering. Those exact formulas should therefore not be treated as requirements of Amnesia Mac Ganja.

During vegetative growth, the plant requires sufficient nutrition to support roots, leaves, and branch development. Once flowering begins, use an appropriate bloom program for the growing system rather than simply increasing phosphorus and potassium as much as possible.

High nutrient concentrations do not automatically produce higher AMG yields or stronger flowers. Excess feeding can cause nutrient stress just as underfeeding can limit development, so adjustments should be based on the plant’s condition rather than on a rigid strain-specific calendar.

The same applies near harvest. There is no need to claim that flushing for a fixed one- or two-week period automatically improves potency, flavor, or smoothness regardless of the growing medium and feeding system being used.

When to Harvest AMG

Indoors, begin evaluating AMG maturity as the cultivar approaches its official 65–70 day flowering window. That period provides a useful reference, but the actual plant should determine the final harvest date.

Flower maturity can vary slightly between phenotypes and growing environments. Inspect overall flower development and trichome maturity rather than harvesting solely because the calendar has reached a predetermined day.

Outdoors, Royal Queen Seeds lists October as the expected harvest month. The exact date will vary according to latitude, seasonal conditions, phenotype, planting time, and local weather.

This longer outdoor schedule is another reason AMG is better suited to regions where autumn conditions remain suitable long enough for a sativa-dominant photoperiod cultivar to complete flowering.

Is AMG Strain Sativa or Indica?

AMG strain is strongly sativa dominant. Royal Queen Seeds officially classifies Amnesia Mac Ganja as:

80% Sativa / 20% Indica

Its genetic background comes from Amnesia × Mexican Haze, which explains the strong sativa influence and relatively long flowering period.

The breeder nevertheless describes its effects as balanced, clear, and stoned rather than simply energetic. Genetic percentages can help describe a cultivar’s lineage and broad characteristics, but they should not be treated as a precise predictor of how every individual plant or finished flower will affect every user.

AMG Strain Effects and THC

Royal Queen Seeds currently lists AMG at up to 22% THC, with low CBD.

The breeder describes the AMG strain effects as balanced, clear, and stoned, while its broader product description emphasizes a strong cerebral and euphoric character associated with its sativa-dominant genetics.

Individual response can vary according to dose, tolerance, phenotype, cannabinoid composition, and finished flower quality. For that reason, breeder descriptions should be treated as general characteristics rather than guaranteed effects.

Claims that AMG treats anxiety, depression, pain, fatigue, or other medical conditions should not be presented as established properties of the cultivar simply because users or individual sources report those experiences.

AMG Flavor and Aroma

Royal Queen Seeds identifies citrus and earthy flavors as the core sensory profile of AMG. Its product description also refers to spicy and herbal characteristics, creating a profile that is sharper and less dessert-oriented than many modern hybrids.

The aroma becomes substantially more noticeable as flowering progresses, which is relevant for indoor cultivation. Growers who require odor control should have suitable extraction and filtration in place before late bloom rather than waiting until the smell becomes difficult to manage.

The previous version of this guide attributed specific effects to individual terpenes without breeder-specific analytical data. A more accurate approach is to describe the verified flavor and aroma profile rather than presenting an unconfirmed dominant-terpene ranking as fact.

Common Problems When Growing AMG

Running Out of Vertical Space Indoors

AMG remains relatively manageable indoors at 80–120 cm, but its sativa-dominant structure can continue stretching after flowering begins. Growers using low tents or restricted vertical spaces should account for that transition rather than waiting until the canopy has nearly reached the light before switching to 12/12.

Using Conflicting Flowering Timelines

AMG has previously been described with flowering periods ranging from eight to twelve weeks. Royal Queen Seeds currently gives a much clearer specification of 65–70 days. Use that official range as the primary planning reference while still checking the actual maturity of individual plants.

Following an Invented Nutrient Formula

There is no breeder-published requirement for AMG to receive exact 3-1-2 and 1-3-2 NPK ratios. Nutrient concentration should reflect the growing medium, plant development, and the nutrient system being used rather than a formula presented as unique to this cultivar.

Choosing an Outdoor Climate With Too Short a Season

AMG is suited to long summers and finishes outdoors during October. In regions with early autumn frost or prolonged cold and rainfall, the cultivar may have less favorable conditions during the final part of flowering.

Allowing the Canopy to Become Overcrowded

Training can help control AMG’s branch development, but the objective should be an open, evenly exposed canopy. Packing too many branches into a small area can reduce light penetration and create stagnant pockets of humid air during flowering.

FAQs About AMG Strain

Is AMG strain sativa or indica?

AMG, or Amnesia Mac Ganja, is strongly sativa dominant. Royal Queen Seeds lists the cultivar as 80% Sativa and 20% Indica, with genetics from Amnesia and Mexican Haze. Its growth pattern, longer flowering period, and cerebral breeder-reported effects reflect that strong Sativa influence while retaining a smaller Indica component.

How long does AMG strain take to flower indoors?

Royal Queen Seeds lists an indoor flowering period of 65–70 days for AMG, equivalent to roughly nine to ten weeks after the switch to a 12/12 light schedule. The total seed-to-harvest cycle is longer because AMG is photoperiod-dependent and growers determine how long the vegetative stage lasts before flowering begins.

How tall does Amnesia Mac Ganja grow?

Royal Queen Seeds lists AMG at approximately 80–120 cm indoors and 140–200 cm outdoors. Final height can vary with vegetative time, container size, training, light intensity, root space, climate, and phenotype. Indoor growers can control much of the final size by deciding when to initiate the flowering cycle.

How much can AMG strain yield indoors and outdoors?

Royal Queen Seeds lists indoor AMG yields of approximately 450–500 g/m² and outdoor production of around 550–600 g per plant. These are breeder potential figures rather than guaranteed harvests. Final yield depends on plant size, lighting, root space, climate, nutrition, training, environment, and the individual phenotype being cultivated.

What is the THC level and effect of AMG strain?

Royal Queen Seeds lists AMG at up to 22% THC with low CBD. The breeder describes its effects as balanced, clear, and stoned, with a pronounced cerebral component associated with its 80% Sativa genetics. Individual experiences can differ according to dose, tolerance, phenotype, cannabinoid profile, and finished flower quality.

What genetics are used to create AMG strain?

AMG stands for Amnesia Mac Ganja and was created from Amnesia × Mexican Haze genetics. Royal Queen Seeds identifies the resulting cultivar as 80% Sativa and 20% Indica. This lineage contributes to its long flowering period, outdoor height potential, citrus-earthy profile, and strongly cerebral breeder-reported effects.