Runtz Muffin cannabis seeds packaging — Royal King Seeds UK
Indica
THC 29%
⚡ High Potency
IndicaFeminisedIn Stock

Runtz Muffin Feminised

Feminised PhotoperiodSee Lab Report →

Grow Runtz Muffin Feminised in the UK. Indica genetics at 29% THC, known for euphoric, calm 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 2026-09-11 on 200 seeds.

Germination rate: 98.3% (n=200)
Last QC test date: 2026-09-11
Indoor yield: 498-640 g/m² (avg across 6 verified grower reports)
Outdoor yield: 570-856 g/plant (avg across 5 verified grower reports)

About Runtz Muffin Feminised

Read Runtz Muffin backwards from the harvest: 550-650 g/m2 under lights, 1000 g/plant outdoors, with resin filling out towards 29% THC. Most of the final weight lands between weeks five and eight, when the 71/29 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 56-63 days of bloom decide whether you reach the top of this strain's range (550-650 g/m2 indoors, 1000 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: 56-63 days. Indoor yield: 550-650 g/m2. Outdoor yield: 1000 g/plant. Plant height: 100-120 cm. Rated intermediate difficulty.

Flavour, aroma and effect

Runtz Muffin arrives in stages. The first draw at 29% THC brings dry pepper that registers at the back of the throat. The euphoric, 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. This combination turns up often in cultivars that win things, and it is usually the one growers comment on when a jar is opened for the first time after curing. Caryophyllene anchors the aroma, myrcene occupies the middle, and bisabolol sits behind both — which is the part that separates this strain from others sharing its primary terpene.

Who it suits

Who does well with Runtz Muffin? 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
🧘Calm
67% of people reported feeling Calm
😌Relaxed
58% of people reported feeling Relaxed
😴Sleepy
58% of people reported feeling Sleepy
😊Happy
45% of people reported feeling Happy
🤤Hungry
41% of people reported feeling Hungry
🌿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 71%Sativa 29%

Strain Data Sheet

🧬THC29% - 32% (Very High)
🌿LineageIndica-Dominant Hybrid (Undisclosed Lineage)
🔬TypeFeminised Indica
🌡ClimateCool–temperate / continental
📅HarvestLate Sept – Oct, UK outdoor (typical)
📏Height100-120 cm
⚖️YieldHigh
🏠Yield Indoor550-650 g/m2
🌳Yield Outdoor1000 g/plant
⏱Flowering Time56-63 days

Packaging

Resealable +
RK
Royal King Seeds
Photoperiod
Feminised Premium
Seeds
Premium Genetics
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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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Runtz Muffin Feminised
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Runtz Muffin 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
Two-Generation Backcross Programme — recurrent-parent fixing
Stabilisation Notes — What This Means for Your Grow

The Runtz Muffin hybrid sits in the middle of the modern dispensary lineage. Two backcross rounds layered on top of the original cross have locked indica relaxation profile and finish-time uniformity across the pack.

Breeding Goal

Carry a clone-derived 2018-2022 hype-era hybrid through to a stable seed pack.

Selection Focus

Chosen for trichome coverage, stout structure and consistent flowering time across the pack.

Pollen / Mother Source

Royal King Genetics breeding facility — pollen from internally selected sibling males of the recurrent parent.

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