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White Nightmare Auto
Well-balanced sativa autoflower with happy and relaxed effects and extended stretch and airy colas. Ideal for intermediate growers seeking potency and reliable yields.
βFlavor:Grapefruit, lime, floral pine
Grower tip: Keep veg short and let the plant finish its auto cycle naturally
Premium stabilized genetics Β· germination guaranteed
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Free Seeds With Every Order
Choose your free strains β no mystery seeds. Learn more
Royal King Genetics β first-party test batch
Numbers below are from our internal seed-lot QC and verified grower submissions, not breeder marketing. Determined from a single batch tested 2026-03-31 on 125 seeds.
About White Nightmare Auto
White Nightmare is a 20/70 sativa testing at 18% THC with a limonene-dominant terpene profile. At a practical level, this means a plant that stretches 40-60% after the flip and produces elongated colas with good light penetration through the canopy, finishing in 8-10 weeks. The Limonene/Pinene combination shapes both the aromatic profile and the effect character β this is not a one-dimensional strain.
Growing Parameters
Flowering time: 8-10 weeks from flip. Indoor yield at 600+ PPFD: 400-500g/mΒ². Outdoor in full sun with 5+ gallon containers: 400-600g/plant. Plant height indoors after training: Short-Medium (2-3.5 ft). Feed EC targets: 1.0-1.4 in veg, 1.4-1.8 in peak flower. pH range: 6.0-6.5 in soil, 5.8-6.2 in coco. Limonene production peaks when day/night temperature differential exceeds 10Β°F in the final two weeks β growers who drop nighttime temps to 62-65Β°F during this window report stronger aromatic development.
This cultivar responds well to topping at the 4th node and moderate defoliation in week 1 and week 3 of flower. SCROG training at a 4x4 grid produces the most uniform canopy distribution. Rated intermediate difficulty.
Effects and Use
At 18% THC, White Nightmare delivers happy, relaxed, uplifted effects with a limonene-influenced character. The onset is cerebral β a brightening of the mental space that arrives within minutes and can enhance focus, creativity, and conversation for 2-3 hours before gradually softening. The body stays comfortable without heaviness. The limonene dominance keeps the mental space bright and slightly elevated even when the body relaxes.
Terpene Profile
Dominant terpenes: Limonene (primary), Pinene (secondary), Terpinolene (tertiary). This combination produces a nose that develops complexity through the cure β expect the primary limonene character to emerge first, with pinene and terpinolene notes adding layers over 3-4 weeks in jars.
Who Should Grow White Nightmare
Best suited for growers who value speed and simplicity β autoflowering genetics mean no light schedule changes, compact plants, and harvest in 10-12 weeks from seed. The intermediate difficulty rating means basic growing competence is sufficient, but attention to detail during flower produces noticeably better results. Ships discreetly to all 50 US states with our germination guarantee.
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White Nightmare Auto β Lab-Verified Cannabinoid & Terpene Data
Independent third-party HPLC analysis. Total THC reported as max-potential (THC + 0.877 Γ THCA). Numbers reflect average across multiple batches; individual phenotypes may vary by 1-3 percent.
White Nightmare Auto β Real Grower Yield Reports
Yield data from US growers cultivating White Nightmare Auto autoflower seeds β submitted with batch codes, photos, and (where available) grower-purchased lab tests. First-time growers should expect 70-85 percent of these numbers.
| Setup | Yield |
|---|---|
| Outdoor, 15-gal fabric pot, partial shade | 309g |
| 5Γ5 tent, 1000W HPS, ScrOG + topping | 202g |
White Nightmare Auto β Sourcing & Genetics
White Nightmare Auto traces its lineage back to landrace genetics from Asia and was modernized through North American breeders selecting for terpene complexity.
Versatile across all US climates β 8-10 week cycle works in any growing window from Maine to Hawaii.
White Nightmare Auto β Breeder Information
Royal King GeneticsBred and stabilized 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 our full breeding process and about page.
White Nightmare is our F5 autoflower line. Five generations of selection have fixed both the autoflower trigger and the cerebral terpene profile the cultivar is known for. The recessive ruderalis trait requires this depth of work to express uniformly.
Lock the autoflower trait in White Nightmare through five generations of selection.
Selected for vigor, controllable stretch, and the cerebral terpene profile sativa growers buy this strain for.
Royal King Genetics in-house breeder room β pollen drawn from a generation-tracked sibling-male line.