A-Train cannabis seeds packaging — Royal King Seeds UK
Indica
THC 21%
🌙 Sleep Aid
IndicaFeminisedIn Stock

A-Train Feminised

Feminised PhotoperiodSee Lab Report →

A-Train Feminised seeds. A indica cultivar at 21% THC delivering relaxed, sleepy, happy. Grow figures from named sources.

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Royal King Genetics — first-party test batch

Figures below are from our internal seed-lot QC and verified UK grower submissions, not breeder marketing. Determined from a single batch tested 2026-09-02 on 150 seeds.

Germination rate: 98.6% (n=150)
Last QC test date: 2026-09-02
Indoor yield: 487-598 g/m² (avg across 15 verified grower reports)
Outdoor yield: 595-814 g/plant (avg across 10 verified grower reports)

About A-Train Feminised

Will A-Train finish outdoors in Britain? Yes, within the April to October season. The habit is compact enough to stay below a fence line, and the dense flower structure puts real weight on a small frame — which is also the reason airflow matters more here than it would in a drier place. Flowering runs 50-60 days, which puts harvest in September or October for most of the country.

What yield is realistic? up to 350 g/m2 indoors is achievable with competent LED lighting and attention to feeding. Outdoors, up to 350 g/plant is realistic in 50 litre pots or in prepared ground with full sun — and "full sun" is doing a lot of work in that sentence at these latitudes, so the position you pick in the garden matters more than the pot you buy. At 21% THC with a myrcene-forward profile, the return on the effort is sound.

Is it forgiving? Reasonably. Anyone comfortable with pH, a feed schedule and a light timer will get a good result. It will not hold your hand, but it will not punish one missed watering either.

Further questions we get asked about A-Train

Which medium? For flavour, peat-free soil cut with about 30% perlite and amended slowly — fish, blood and bone, rock phosphate, seaweed meal, all of it available at any British garden centre. For weight, coco with fertigation at EC 1.4-1.8 through bloom. This indica performs in both; the choice is about what you want out of it.

How does it handle a British summer? The dense foliage shades itself, which helps. Above 30°C growth stalls but the plant does not fold. Mulch the root zone and water before seven in the morning and heat stress stops being a factor in nearly every part of the country. The more common British problem is the opposite one: a cold, wet July that never lets the plant dry out between waterings.

When do I switch to bloom feed? Inside the first week of visible pistils. The 79/21 balance shifts its demand quickly at the transition — phosphorus and potassium up, nitrogen down. Soil growers can top-dress with guano and sulphate of potash; coco and hydro should move to a low-nitrogen bloom formula straight away.

Indoors or outdoors? Both work, for different reasons. Indoors you own the flowering environment completely. Outdoors, across the April to October season, the plant gets a light intensity no domestic LED matches and can reach up to 350 g/plant — at the price of accepting whatever the autumn does. Flowering: 50-60 days. Indoor yield: up to 350 g/m2. Outdoor yield: up to 350 g/plant. Rated intermediate difficulty.

What A-Train is actually like

Growers report relaxed, sleepy, happy as the defining characteristics and our own notes agree. At 21% THC this indica sits where dose control starts to matter. A single bowl through a vaporiser at 185°C gives a manageable physical ease with the head still working, which is what most people want at the end of a day. Push the dose and it moves firmly towards sedation — the reason it tends to become a winter evening cultivar rather than an all-year one. The Myrcene/Humulene pairing leaves earth and faint sweetness on the palate, with fruit at the end.

Best suited to quiet evenings, a film, recovery after exercise, and the hour before sleep.

Terpene breakdown

Primary: Myrcene · Secondary: Humulene · Tertiary: Linalool. How this profile survives the journey from flower to vapour depends on temperature. Low vaporisation, 180-188°C, keeps the humulene and linalool audible over the myrcene base. Run it hotter, or burn it, and the three collapse into one note — pleasant enough, but none of the complexity that made it worth choosing.

Who it suits

A-Train suits growers with the basics in place. Understand pH, rough nutrient ratios and light cycles before you commit to it; it asks for competence rather than expertise. Photoperiod genetics leave plant size and harvest date under your control — veg longer for bigger plants, or flip early when space is short. The April to October season accommodates a bloom of 50-60 days comfortably for outdoor growers across the country.

Effects

😌Relaxed
72% of people reported feeling Relaxed
😴Sleepy
72% of people reported feeling Sleepy
😊Happy
58% of people reported feeling Happy
🤤Hungry
54% of people reported feeling Hungry
🤗Euphoric
47% of people reported feeling Euphoric
🧘Calm
40% of people reported feeling Calm
🌿Stress Relief
27% of people reported feeling Stress Relief
💆Body High
24% of people reported feeling Body High
😶‍🌫️Sedated
21% of people reported feeling Sedated

Strain Type

Indica 79%Sativa 21%

Strain Data Sheet

🧬THC21% - 26% (High)
🌿LineageIndica-Dominant Hybrid (Undisclosed Lineage)
🔬TypeFeminised Indica
🌡ClimateCool–temperate / continental
📅HarvestLate Sept – Oct, UK outdoor (typical)
📏Height90 – 120 cm (typical)
⚖️YieldMedium
🏠Yield Indoorup to 350 g/m2
🌳Yield Outdoorup to 350 g/plant
⏱Flowering Time50-60 days

Packaging

Resealable +
RK
Royal King Seeds
Photoperiod
Feminised Premium
Seeds
Premium Genetics
Protective vial
Resealable +
Royal King Seeds supplies seeds as adult novelty collectibles and for genetic preservation. Purchasers must comply with all applicable United Kingdom legislation.
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A-Train Feminised
royalkingseeds.co.uk
IG
FB
X
🔒Sealed for authenticity
💧Waterproof coating
🛡️Aluminium interior lining
🏷️Protective sticker
📱QR code verification
🔢Scratchable serial number

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A-Train Feminised — Breeder Information

Royal King Genetics

Bred and stabilised in-house by Royal King Genetics — our internal breeding team. Every batch is QC'd and germ-tested above 99% before it ships. Read the full breeding process and about page.

Stabilisation Level
BX2
Generations
3+
Breeding Programme
Royal King Genetics Backcross Line — BX2 modern hybrid stabilisation
Stabilisation Notes — What This Means for Your Grow

Two backcross generations to the recurrent parent have welded A-Train into a stable seed line. The cross-derived compact internode spacing expresses uniformly — no surprise-pheno hunting once the pack pops.

Breeding Goal

Pin the compact internode spacing that came out of the original A-Train cross.

Selection Focus

Chosen for indica vigour, compact bud formation and a reliable finish window.

Pollen / Mother Source

Royal King Genetics in-house breeder room — pollen taken from a generation-tracked sibling-male line.

Last Batch QC Verified
1 September 2026· 99%+ germination