Lethal Purple cannabis seeds packaging — Royal King Seeds UK
Hybrid
THC 20%
📈 High Yield
HybridFeminisedIn Stock

Lethal Purple Feminised

Feminised PhotoperiodSee Lab Report →

Grow Lethal Purple Feminised in the UK. Hybrid genetics at 20% THC, known for relaxed, happy, euphoric 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 2026-09-17 on 100 seeds.

Germination rate: 98.9% (n=100)
Last QC test date: 2026-09-17
Indoor yield: 472-606 g/m² (avg across 16 verified grower reports)
Outdoor yield: 662-1018 g/plant (avg across 7 verified grower reports)

About Lethal Purple Feminised

Cured properly and opened cold, Lethal Purple leads with limonene: citrus oil off the top of the jar, nearer grapefruit pith than lemon squash, the sweetness arriving late. Underneath it caryophyllene adds a dry peppery floor, and it reads mid-palate rather than on the first pass. This 38/62 hybrid tests at 20% THC, but potency is the least interesting number here: what separates Lethal Purple from the others on the same shelf is how the aroma behaves across a cure, and that is a question of storage and patience rather than genetics alone.

Growing it for the nose rather than the scales

Chasing terpene expression in Lethal Purple pulls against chasing yield, and it is worth knowing which one you are doing before you start. The Limonene/Caryophyllene/Linalool profile does its best work in living soil, where the microbial side produces secondary compounds a bottle cannot. That is easier here than it sounds: decent peat-free compost and worm castings are a garden centre purchase in most British towns.

Through the 60 days of bloom, stop foliar spraying after week two — anything landing on developing trichomes is still there at harvest and you will taste it. The final three weeks decide which terpenes dominate the cured flower: nights held at 16-18°C push limonene forward, while a warmer finish protects the lighter linalool notes at the top.

The cure is where most of the flavour is lost in this country, and the reason is the weather. A 10-14 day hang wants 15-18°C at 55-60% relative humidity, which a British autumn will not give you in a spare room — a temperature-controlled cupboard or a wine fridge set to 16°C solves it for the price of one wasted harvest. Then into glass, burped twice a day for the first fortnight. The caryophyllene layer that makes this one worth growing does not appear until somewhere between weeks three and four in the jar.

Flowering: 60 days. Indoor yield: up to 450 g/m2. Outdoor yield: up to 450 g/plant. Rated intermediate difficulty.

Flavour, aroma and effect

Lethal Purple arrives in stages. The first draw at 20% THC brings a bright citrus edge that lifts off the palate immediately. The relaxed, happy, euphoric character follows within minutes, as a head and body effect at once. The mind stays clear while the muscles let go by degrees, which is what makes it adaptable — a small dose carries an afternoon, a larger one turns into an evening. The caryophyllene underneath adds a warmth that keeps the whole thing anchored.

Terpene breakdown

Primary: Limonene · Secondary: Caryophyllene · Tertiary: Linalool. How this profile survives the journey from flower to vapour depends on temperature. Low vaporisation, 180-188°C, keeps the caryophyllene and linalool audible over the limonene 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 Lethal Purple? 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

😌Relaxed
72% of people reported feeling Relaxed
😊Happy
65% of people reported feeling Happy
🤗Euphoric
60% of people reported feeling Euphoric
🤩Creative
56% of people reported feeling Creative
😎Uplifted
45% of people reported feeling Uplifted
🤤Hungry
41% of people reported feeling Hungry
😴Sleepy
38% of people reported feeling Sleepy
😆Giggly
31% of people reported feeling Giggly
🧠Focused
21% of people reported feeling Focused

Strain Type

Indica 38%Sativa 62%

Strain Data Sheet

🧬THC20% - 25% (High)
🌿LineageBalanced Hybrid (Undisclosed Lineage)
🔬TypeFeminised Hybrid
🌡ClimateTemperate, adaptable
📅HarvestLate Sept – Oct, UK outdoor (typical)
📏Height100 – 160 cm (typical)
⚖️YieldMedium – High
🏠Yield Indoorup to 450 g/m2
🌳Yield Outdoorup to 450 g/plant
⏱Flowering Time60 days

Packaging

Resealable +
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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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Lethal Purple Feminised
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Lethal Purple 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

Lethal Purple carries clone-derived parents from the mid-2010s. We backcrossed twice to the dominant parent (BX2) to weld cut-specific traits into seed-stable form. Vigour and finish-time consistency run uniform across the population.

Breeding Goal

Pin the finish-time consistency that came out of the original Lethal Purple cross.

Selection Focus

Chosen for balanced indica/sativa expression, terpene fidelity and pack-to-pack uniformity.

Pollen / Mother Source

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

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