Free Seeds With Every Order
Choose your free strains — no mystery seeds. Learn more
Critical Fast Bud Auto
Well-balanced indica autoflower with euphoric and calm effects and dense bud formation. Ideal for intermediate growers seeking flavor depth and consistent results.
◉Flavor:Earthy pine, sweet berry, subtle hash
Grower tip: Watch humidity on dense autos — below 50% during flower
Premium stabilized genetics · germination guaranteed
Ready to grow this strain?
Free Seeds With Every Order
Choose your free strains — no mystery seeds. Learn more
Royal King Genetics — 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 2026-03-30 on 125 seeds.
About Critical Fast Bud Auto
Critical Fast Bud is a 70/30 indica testing at 20% THC with a linalool-dominant terpene profile. At a practical level, this means a plant that stays compact with tight internodal spacing and develops dense, resin-coated flower clusters that finish in 8-10 weeks. The Linalool/Myrcene combination shapes both the aromatic profile and the effect character — this is not a one-dimensional strain.
Growing Parameters
Flowering time: 8-10 weeks from flip. Indoor yield at 600+ PPFD: 300-400g/m². Outdoor in full sun with 5+ gallon containers: 500-700g/plant. Plant height indoors after training: Tall (4-5 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. Linalool production peaks when day/night temperature differential exceeds 10°F in the final two weeks — growers who drop nighttime temps to 62-65°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.
What Users Report
Critical Fast Bud at 20% THC produces euphoric, calm sensations that users consistently describe as physically comforting without being immobilizing at moderate doses. The relaxation builds gradually — noticeable within 10 minutes, settling fully by the 20-minute mark, and sustaining for 2-3 hours. The Linalool/Myrcene terpene pairing gives this strain a distinctive effect signature that experienced users recognize as different from other indicas at similar THC levels.
Best suited for evening use, unwinding after a long day, and situations where deep physical relaxation is the goal.
Terpene Profile
Dominant terpenes: Linalool (primary), Myrcene (secondary), Caryophyllene (tertiary). This combination produces an aroma profile that is immediately identifiable when the jar opens and translates well to both vaporization (best at 360-385°F) and combustion, though lower temperatures preserve the myrcene top notes that combustion destroys.
Who Should Grow Critical Fast Bud
This strain fits growers with at least one harvest behind them who want to step up in quality without dramatically increasing complexity. The autoflowering genetics simplify the growing process — no light schedule management, compact size, and a fast seed-to-harvest timeline. Indoor growers in any US state can run this strain with standard tent equipment. Outdoor growers should match the 8-10 weeks flowering period to their frost-free window.
Effects
Best For
Strain Type
Strain Data Sheet
Packaging
Regular
Seeds
authenticity
lining
number
Related Strains

5 Alive Feminized
Buy 5 Alive Feminized cannabis seeds online in the USA. Sativa strain with 29% THC. Effects: Euphoric, Energetic, Calm. Discreet shipping to all 50 states with germination guarantee.

Red Bruce Feminized
Buy Red Bruce Feminized cannabis seeds online in the USA. Indica strain with 15% THC. Effects: Relaxed, Sleepy, Happy. Discreet shipping to all 50 states with germination guarantee.

Silver Kush Auto
Buy Silver Kush Auto cannabis seeds online in the USA. Hybrid strain with 20% THC. Effects: Happy, Relaxed, Uplifted. Discreet shipping to all 50 states with germination guarantee.

CBD Critical Cure Feminized
Buy CBD Critical Cure Feminized CBD cannabis seeds online in the USA. Lab-verified 12.8% CBD / 0.8% THC — a daytime-friendly therapeutic strain. Effects: Focused, Calm. Discreet US shipping with germination guarantee.
Critical Fast Bud Auto — Lab-Verified Cannabinoid & Terpene Data
Independent third-party HPLC analysis. Total THC reported as max-potential (THC + 0.877 × THCA). Numbers reflect average across multiple batches; individual phenotypes may vary by 1-3 percent.
Critical Fast Bud Auto — Real Grower Yield Reports
Yield data from US growers cultivating Critical Fast Bud Auto autoflower seeds — 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 |
|---|---|
| 5×5 tent, 1000W HPS, ScrOG + topping | 223g |
| 4×4 tent, 1000W HPS, SCROG | 223g |
| 5×5 tent, 730W LED, SCROG | 222g |
Critical Fast Bud Auto — Sourcing & Genetics
Critical Fast Bud Auto was hybridized in the past five years by combining classic Indica/Sativa parent lines with modern high-THC genetics.
Versatile across all US climates — 8-10 week cycle works in any growing window from Maine to Hawaii.
Critical Fast Bud Auto — Breeder Information
Royal King GeneticsBred and stabilized in-house by Royal King Genetics — 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.
Critical Fast Bud is an autoflowering line that has been worked through five generations of Royal King Genetics autoflower stabilization. The autoflower trait is recessive — fixing it requires multi-generation work — and at F5 the auto trigger and finish window are locked across the pack.
Reach auto trigger and finish-window uniformity for the Critical Fast Bud pack.
Selected for purple/dark expression where present, dense bud structure, and indica relaxation profile.
Royal King Genetics breeding facility — pollen from internally selected sibling males of the recurrent parent.