RK
Haze XL cannabis seeds packaging β€” Royal King Seeds the UK
Indica
THC 17%
🎨 Creative
IndicaFeminizedIn Stock

Haze XL Feminized

Feminized PhotoperiodSee Lab Report β†’

Grow Haze XL Feminized in the UK. Indica genetics testing at 17% THC. Known for euphoric, creative effects. Ships discreetly UK-wide with germination guarantee.

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Β£11.05
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πŸ”’Unmarked Packaging

About Haze XL Feminized

Here is what Haze XL delivers at harvest: 400-600 g/m2 per square metre indoors, 600 g/plant per plant outdoors in UK conditions, with resin production peaking at 17% THC. Those numbers tell a story when you work backwards through the 8-10 weeks window. The bulk of your final weight accumulates during weeks 5 through 8 β€” a period where the 67/33 genetics stack calyxes rapidly and trichome coverage shifts from scattered to frosted. Southern Hemisphere outdoor growers targeting a late-March harvest should calculate their flip date (or natural light trigger) accordingly, aiming for buds to enter this critical fattening stage during February when UK daylight hours are still generous.

Maximising Your Harvest

To reach the upper end of this strain's yield potential (400-600 g/m2 indoors, 600 g/plant outdoors), focus your efforts on three critical windows during the 8-10 weeks period.

Window 1: The first 10 days after flowering begins. Stretch management determines canopy uniformity, which directly impacts light distribution and final yield. Expect modest stretch of 20-30% β€” a quick defoliation of lower fan leaves at day 7 redirects energy to developing bud sites.

Window 2: Weeks 3-5 of bloom. Caryophyllene terpene biosynthesis ramps up during this period. Maintain a day/night temperature differential of at least 6-8Β°C to encourage terpene accumulation β€” UK autumn evenings (March-April) naturally provide this swing for outdoor growers. Indoor cultivators should target 25-26Β°C during lights-on and 18-20Β°C during lights-off. Supplement with potassium-heavy bloom nutrients at EC 1.6-1.8.

Window 3: Final 10-14 days before harvest. Cease all nutrient input and flush with pH-adjusted water. Monitor trichomes daily with a 60x jeweller's loupe β€” harvest at 15-20% amber for the full-bodied effect this genetics is known for. Southern Hemisphere outdoor growers: this window typically falls in late March through mid-April.

Flowering: 8-10 weeks. Indoor yield: 400-600 g/m2. Outdoor yield: 600 g/plant. Rated intermediate difficulty.

Flavour, Aroma, and Experience

The sensory arc of Haze XL unfolds in stages. Initial inhalation at 17% THC brings a warm peppery spice that tingles at the back of the throat. The euphoric, creative effects emerge within minutes, beginning as a pleasant heaviness behind the eyes that migrates downward through the shoulders, chest, and limbs. By the fifteen-minute mark, a deep physical stillness sets in β€” not sedation exactly, but a reluctance to move that makes the couch remarkably appealing. Duration runs 2-3 hours at moderate doses. The myrcene secondary terpene adds a distinct layer: additional body depth that reinforces the physical dimension.

Terpene Breakdown

Primary: Caryophyllene Β· Secondary: Myrcene Β· Tertiary: Bisabolol. This particular terpene trio appears frequently in award-winning cultivars and produces a nose that most UK growers find immediately appealing when jars are first opened after curing. The caryophyllene dominance anchors the aroma, myrcene provides mid-range character, and bisabolol contributes a subtle background note that distinguishes this strain from others sharing the same primary terpene.

Suitability and Recommendations

Who grows Haze XL successfully? Indoor growers seeking full control over their harvest timeline. Outdoor cultivators who want to decide exactly when flowering begins. Anyone with the space and patience to vegetate this plant to its full potential before triggering bloom. Difficulty is rated intermediate, meaning a moderate learning curve that rewards attention without demanding laboratory-grade conditions. Delivered UK-wide in discreet, unbranded packaging with germination guarantee included.

Effects

πŸ€—Euphoric
74% of people reported feeling Euphoric
🀩Creative
70% of people reported feeling Creative
😌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
🧘Calm
33% of people reported feeling Calm
🌿Stress Relief
20% of people reported feeling Stress Relief
πŸ’†Body High
17% of people reported feeling Body High

Strain Type

Indica 67%Sativa 33%

Strain Data Sheet

🧬THC17% - 21% (Medium-High)
🌿LineageIndica-Dominant Hybrid (Undisclosed Lineage)
πŸ”¬TypeFeminized Indica
🌑ClimateCool–temperate / continental
πŸ“…HarvestLate Sept – Oct, UK outdoor (typical)
πŸ“Height90 – 120 cm (typical)
βš–οΈYieldHigh
🏠Yield Indoor400-600 g/m2
🌳Yield Outdoor600 g/plant
⏱Flowering Time8-10 weeks

Packaging

Resealable +
RK
Royal King Seeds
Photoperiod
Feminized 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 UK Commonwealth, state, and territory legislation.
1
Haze XL Feminized
royalkingseeds.co.uk
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πŸ”’Sealed for authenticity
πŸ’§Waterproof coating
πŸ›‘οΈAluminium interior lining
🏷️Protective sticker
πŸ“±QR code verification
πŸ”’Scratchable serial number

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Haze XL Feminized β€” Breeder Information

Royal King Genetics

Bred and stabilised in-house by Royal King Genetics β€” 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
F5 IBL
Generations
5+
Breeding Programme
IBL Heritage Programme β€” five-generation inbred fixing
Stabilisation Notes β€” What This Means for Your Grow

A heritage cultivar that we have taken through five rounds of inbred selection. The recent-era reference profile β€” terpene fingerprint, finishing window, plant frame β€” has been welded into the population. Every seed in the pack carries the trait set that put Haze XL on the map.

Breeding Goal

Bring the original Haze XL reference profile back to true-to-type seed stock.

Selection Focus

Chosen for resin density, indica-leaning frame and tight internodes that suit indoor production.

Pollen / Mother Source

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

Last Batch QC Verified
18 March 2026Β· 99%+ germination