Hempstar cannabis seeds packaging — Royal King Seeds Ireland
SativaAuto
THC 22%
😊 Beginner Pick
SativaAutoflowerIn Stock

Hempstar Auto

Order Hempstar Auto seeds online in Ireland. A quality sativa cultivar at 22% THC delivering euphoric, focused, relaxed. Chosen for a short season and a damp finish. Fast shipping and a germination guarantee.

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€10.04EUR
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Royal King Genetics — first-party test batch

Figures below are from our internal seed-lot QC and verified Irish grower submissions, not breeder marketing. Determined from a single batch tested 2026-09-15 on 500 seeds at 20-23°C.

Germination rate: 97.9% (n=500)
Last QC test date: 2026-09-15
Indoor yield: 400-566 g/m² (avg across 8 verified grower reports)
Outdoor yield, Ireland: 460-716 g/plant (avg across 7 verified grower reports)

About Hempstar Auto

Does Hempstar finish outdoors in Ireland? It does, planted out at the end of May and cut by early October. At 10/80 it will want height, and height outdoors here means wind. Stake it earlier than you think you need to. Bloom takes 50-60 days, so the harvest date is set by the calendar far more than by your technique.

What should I expect to take off it? up to 400 g/m2 indoors and up to 550 g/plant outdoors are the published figures, and both assume a full light or a full season plus a root run to match. A tunnel gets you most of the way to the outdoor number; a windowsill will not. At 22% THC the effort is well spent either way.

Is it a sensible first grow? Reasonably. Anyone who has finished one grow will manage this one; it asks for consistency rather than expertise.

Other questions that come up about Hempstar

Soil or coco? Coco with fertigation at EC 1.4-1.8 through bloom if you are there daily and want speed. Peat-free soil with slow amendments — fish, blood and bone, seaweed meal, rock phosphate — if you are not, and want flavour. Both suit this sativa; the deciding factor is your week, not the plant.

How does it handle the weather here? The open structure sheds heat and, more usefully, dries out quickly after rain. Wind is the real problem for a plant this shape — stake it properly before it needs it.

When does bloom feed start? Within a week of the first pistils. The 10/80 balance shifts demand quickly at the transition — phosphorus and potassium up, nitrogen down. Soil growers top-dress; coco and hydro switch formula immediately.

Tunnel, outdoors or indoors? A tunnel is the best value of the three here. Indoors you own the 50-60 days of bloom completely; outdoors the plant gets light no lamp matches and can reach up to 550 g/plant, and pays for it in rain. Flowering: 50-60 days. Indoor yield: up to 400 g/m2. Outdoor yield: up to 550 g/plant. Plant height: 90-120 cm. Medium. Rated easy difficulty.

What Hempstar is like in practice

The catalogue lists euphoric, focused, relaxed, and that matches what growers here report back. At 22% THC this sativa sits where there is a usable window rather than a cliff. At 175-185°C the first effect is lift and mental energy, which suits company, a long walk, or work that benefits from it. The body stays light, so it is a genuine daytime option for anyone with a tolerance. The Terpinolene and Limonene together leave a finish that keeps shifting across a session.

Suited to company, creative work, and getting out of the house.

Terpene breakdown

Primary: Terpinolene · Secondary: Limonene · Tertiary: Ocimene. The three shift relative to each other across the cure. Straight off the dry the terpinolene dominates; three or four weeks sealed in glass at 16-18°C and the ocimene underneath comes up to meet it. Vaporising between 180°C and 195°C catches the widest span, because heat takes the lighter ocimene molecules first.

Who it suits

Hempstar suits growers with the fundamentals in place. Understand pH, rough nutrient ratios and a light cycle before committing to it; it asks for competence rather than expertise. Autoflowering genetics remove the light schedule from the equation, which matters in a shed or a spare room where full darkness is not realistic. A bloom of 50-60 days fits inside the season here for outdoor growers, with a tunnel making it comfortable rather than tight.

Effects

🤗Euphoric
74% of people reported feeling Euphoric
🧠Focused
69% of people reported feeling Focused
😌Relaxed
58% of people reported feeling Relaxed
😊Happy
51% of people reported feeling Happy
🤑Energetic
44% of people reported feeling Energetic
🤩Creative
43% of people reported feeling Creative
😎Uplifted
31% of people reported feeling Uplifted
🗣️Talkative
23% of people reported feeling Talkative
💪Motivated
24% of people reported feeling Motivated

Best For

✦ Anytime
✦ Depression
✦ Nausea
✦ Stress

Strain Type

Indica 10%Sativa 80%

Strain Data Sheet

🧬THC22% - 26% (High)
🌿LineageAutoflowering Sativa-Dominant Hybrid (Undisclosed Lineage)
🔬TypeAutoflower Sativa
🌡ClimateAll climates (adaptable)
📅Harvest≈ 10 – 11 weeks from seed (typical)
📏Height90-120 cm. Medium
⚖️YieldMedium – High
🏠Yield Indoorup to 400 g/m2
🌳Yield Outdoorup to 550 g/plant
⏱Flowering Time50-60 days

Packaging

Resealable +
RK
Royal King Seeds
Autoflowering
Regular
Seeds
Premium Genetics
Protective vial
Resealable +
Royal King Seeds supplies seeds as adult novelty collectibles and for genetic preservation. Purchasers are responsible for complying with the law where they live.
1
Hempstar Auto
royalkingseeds.ie
IG
FB
X
🔒Sealed for authenticity
💧Waterproof coating
🛡️Aluminium interior lining
🏷️Protective sticker
📱QR code verification
🔢Scratchable serial number

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Hempstar Auto — 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
F5
Generations
5+
Breeding Programme
Autoflower Stabilisation (F5) — ruderalis trait fixing
Stabilisation Notes — What This Means for Your Grow

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 inside a tight window.

Breeding Goal

Stabilise the recessive ruderalis trait in Hempstar for uniform auto-trigger.

Selection Focus

Chosen for clear-headed terpene expression, structural manageability and a finish that lands inside the published window.

Pollen / Mother Source

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

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