Marcosus Marshmellow cannabis seeds packaging — Royal King Seeds UK
Indica
THC 14%
🎨 Creative
IndicaFeminisedIn Stock

Marcosus Marshmellow Feminised

Feminised PhotoperiodSee Lab Report →

Grow Marcosus Marshmellow Feminised in the UK. Indica genetics at 14% THC, known for euphoric, creative, focused effects.

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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 2026-09-06 on 400 seeds.

Germination rate: 97.2% (n=400)
Last QC test date: 2026-09-06
Indoor yield: 454-630 g/m² (avg across 6 verified grower reports)
Outdoor yield: 638-820 g/plant (avg across 9 verified grower reports)

About Marcosus Marshmellow Feminised

Read Marcosus Marshmellow backwards from the harvest: up to 350 g/m2 under lights, up to 450 g/plant outdoors, with resin filling out towards 14% THC. Most of the final weight lands between weeks five and eight, when the 87/13 genetics stack calyxes quickly and the trichome cover goes from scattered to solid. Outdoors you want that stage falling in late August and early September while the light is still long, so count back to it from the first frost your own area usually sees rather than from a date on a packet.

Getting the weight out of this plant

Three stretches of the 50-70 days of bloom decide whether you reach the top of this strain's range (up to 350 g/m2 indoors, up to 450 g/plant outdoors). The rest is maintenance.

The first ten days of flower. What the plant does during the stretch sets canopy height, and canopy height sets how evenly the light lands. Expect 20-30%, which is manageable; stripping the lowest fans around day seven sends the energy up to the sites that will actually finish.

Weeks three to five. Caryophyllene production climbs through here, and it responds to a day-night temperature gap of 6-8°C. British autumn nights hand that to outdoor growers for free from September; indoors you have to build it, at roughly 25-26°C lights-on and 18-20°C lights-off. Bloom feed goes potassium-heavy around EC 1.6-1.8.

The last ten to fourteen days. Stop feeding and run pH-corrected water. Check trichomes daily under a 60x loupe — cut at 15-20% amber for the weight of effect this genetics is bought for. Outdoors that lands between late September and mid-October across most of Britain, and the weather forecast should get a vote.

Flowering: 50-70 days. Indoor yield: up to 350 g/m2. Outdoor yield: up to 450 g/plant. Rated intermediate difficulty.

Flavour, aroma and effect

Marcosus Marshmellow arrives in stages. The first draw at 14% THC brings dry pepper that registers at the back of the throat. The euphoric, creative, focused, calm character follows within minutes, starting as weight behind the eyes and working down through the shoulders and chest. By about a quarter of an hour it has become a physical stillness — not sedation so much as a strong disinclination to get up. Two to three hours at a moderate dose. The myrcene underneath adds body and depth beneath the rest.

Terpene breakdown

Primary: Caryophyllene · Secondary: Myrcene · Tertiary: Bisabolol. How this profile survives the journey from flower to vapour depends on temperature. Low vaporisation, 180-188°C, keeps the myrcene and bisabolol audible over the caryophyllene 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

Who does well with Marcosus Marshmellow? Indoor growers who want the timeline under their own control. Outdoor growers who want to choose when flowering starts. Anyone with the room and the patience to veg it properly before flipping. Difficulty is rated intermediate, which means a moderate learning curve that rewards attention without demanding a laboratory.

Effects

🤗Euphoric
74% of people reported feeling Euphoric
🤩Creative
70% of people reported feeling Creative
🧠Focused
62% of people reported feeling Focused
🧘Calm
53% of people reported feeling Calm
😌Relaxed
45% of people reported feeling Relaxed
😴Sleepy
45% of people reported feeling Sleepy
😊Happy
31% of people reported feeling Happy
🤤Hungry
27% of people reported feeling Hungry
🌿Stress Relief
13% of people reported feeling Stress Relief

Strain Type

Indica 87%Sativa 13%

Strain Data Sheet

🧬THC14% - 19% (Medium)
🌿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 450 g/plant
⏱Flowering Time50-70 days

Packaging

Resealable +
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Royal King Seeds
Photoperiod
Feminised Premium
Seeds
Premium Genetics
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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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Marcosus Marshmellow Feminised
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Marcosus Marshmellow 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
F4
Generations
4+
Breeding Programme
F4 Production Line — modern cross stabilisation
Stabilisation Notes — What This Means for Your Grow

Marcosus Marshmellow has been progressed through four generations of phenotype hunting and selection. Vigour, tight finish window and finishing time are all locked across the pack — every plant performs to the spec sheet.

Breeding Goal

Stabilise the Marcosus Marshmellow cross over four selection rounds.

Selection Focus

Chosen for resin output, a low-slung stature and a clean indica terpene fingerprint.

Pollen / Mother Source

Royal King Genetics select-mother programme — pollen drawn from an internally maintained reversed-female line.

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