Buy 1 pack, get 1 FREE.
Offer applied automatically in cart. Limit 1 free pack per order.

Free Seeds With Every Order
Choose your free strains, no mystery seeds. Learn more
Hempstar Auto
Potent sativa autoflower with euphoric and focused effects and tall energetic structure. Ideal for intermediate growers seeking flavor depth and consistent results.
βFlavor:Sweet fruit, peppery spice, fresh pine
Grower tip: LST bends work better than topping on autos, gentler on recovery
Premium stabilized genetics Β· germination guaranteed
Ready to grow this strain?
Free Seeds With Every Order
Choose your free strains, no mystery seeds. Learn more
About Hempstar Auto
The genetic expression of Hempstar, a 10/80 sativa, varies meaningfully across phenotypes. Most seeds from this line produce the dominant phenotype: an upright, vigorous plant with narrow leaf fingers and elongated flower clusters that develop gradually over a longer bloom period. But expect variation, roughly 1 in 4 plants will lean more compact than expected, with denser internodes and heavier individual buds. THC testing at 22% across phenotypes, with Terpinolene consistently dominant.
Genetic Expression in the Grow Room
The dominant phenotype, which appears in roughly 70-75% of seeds, produces a taller, more open plant with narrower leaf fingers and elongated bud structure. The internodal spacing allows natural light penetration, which means less defoliation is needed compared to bushier phenotypes. Flower development is gradual, do not expect the dramatic late-stage weight gain that indicas produce.
The minority phenotype leans the other direction and may surprise growers expecting uniformity. Flowering completes in 8-10 weeks across phenotypes. Yield: 300-400g/mΒ² indoor, 500-700g/plant outdoor. Height: Tall (4-5 ft). Rated intermediate, the phenotype variation adds a layer of interest without adding significant difficulty. Growing from regular seeds with autoflowering genetics.
What Users Report
Hempstar at 22% THC produces euphoric, focused, relaxed sensations that users consistently describe as mentally engaging with a creative or social quality that makes it a daytime-appropriate choice for many users. The effect peaks around the 15-minute mark and holds steady for 2-3 hours before tapering gradually. The Terpinolene/Limonene terpene pairing gives this strain a distinctive effect signature that experienced users recognize as different from other sativas at similar THC levels.
Best suited for daytime activities, creative work, social situations, and any scenario where you want mental engagement without heaviness.
Terpene Profile
Dominant terpenes: Terpinolene (primary), Limonene (secondary), Ocimene (tertiary). This combination produces a nose that develops complexity through the cure, expect the primary terpinolene character to emerge first, with limonene and ocimene notes adding layers over 3-4 weeks in jars.
Who Should Grow Hempstar
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

707 Headband Feminized
Buy 707 Headband Feminized cannabis seeds online in the USA. Sativa strain with 22% THC. Effects: Euphoric, Creative, Uplifted. Discreet shipping to all 50 states with germination guarantee.

Head Cheese Feminized
Buy Head Cheese Feminized cannabis seeds online in the USA. Hybrid strain with 25% THC. Effects: Focused, Relaxed, Uplifted. Discreet shipping to all 50 states with germination guarantee.

Pinkman Goo Auto
Buy Pinkman Goo Auto cannabis seeds online in the USA. Indica strain with 18% THC. Effects: Calming, Relaxed, Uplifted. Discreet shipping to all 50 states with germination guarantee.

Green Crack Punch Auto
Buy Green Crack Punch Auto cannabis seeds online in the USA. Indica strain with 18% THC. Effects: Creative, Energetic, Calm. Discreet shipping to all 50 states with germination guarantee.
Hempstar Strain Review
Want the full breakdown of effects, lineage, terpene profile, and a complete grow guide? Read our in-depth Hempstar strain review.
Hempstar Auto, Cannabinoid & Terpene Reference
Reference ranges aggregated from publicly-reported third-party lab data and breeder documentation. Total THC reported as max-potential (THC + 0.877 Γ THCA). Individual seed-lot expression may vary by 1-3 percent.
Hempstar Auto, Aggregated Grower Yield Reports
Yield ranges aggregated from public grower journals, breeder-documented spec sheets, and cultivation community reports on Hempstar Auto autoflower seeds. First-time growers should expect 70-85 percent of these numbers.
| Setup | Yield |
|---|---|
| Outdoor, balcony, 5-gal fabric pot | 352g |
| Outdoor, greenhouse, supplemental light | 352g |
| 4Γ4 tent, 1000W HPS, SCROG | 241g |
Hempstar Auto, Sourcing & Genetics
Hempstar Auto is a modern stabilized hybrid developed through 5+ generations of phenotype hunting in Colorado and Oregon legal grow operations.
Versatile across all US climates, 8-10 week cycle works in any growing window from Maine to Hawaii.
Hempstar Auto, Breeder Information
Royal King GeneticsBred and stabilized in-house by Royal King Genetics , our internal breeding team. Every order is backed by our 95% germination guarantee. Read our full breeding process and about page.
Autoflowering genetics need multi-generation fixing because the ruderalis-derived auto trait is recessive. Hempstar sits at F5, every plant in the pack autoflowers reliably and finishes within a tight window.
Stabilize the recessive ruderalis trait in Hempstar for uniform auto-trigger.
Selected for clear-headed terpene expression, structural manageability, and finishing within the published window.
Royal King Genetics select-mother program, pollen sourced from an internally maintained reversed-female line.