
Hempstar Auto
Buy Hempstar Auto seeds in South Africa. Sativa · 22% THC · euphoric, focused, relaxed. Every figure on this page is sourced, and every order ships unbranded.
Royal King Genetics — Seed-Lot Testing
Figures below come from our own seed-lot testing rather than breeder marketing, taken from a single batch tested 2026-04-01 on 400 seeds.
About Hempstar Auto
Will Hempstar handle a South African summer outdoors? Yes. Put this 10/80 sativa in the ground between September and November and you will be cutting from March to May. It will stretch, and it will use every hour of a long summer day, so give it room early rather than trying to contain it later. Bloom runs 50-60 days, placing harvest between March and May across most provinces.
What yield is realistic? up to 400 g/m2 indoors is reachable under decent LED with steady feeding. Outdoors, up to 550 g/plant a plant is normal in 50 litre pots or straight into prepared ground in full sun. At 22% THC with terpinolene in front, the return on effort is good.
How much can go wrong before it shows? Some. Anyone who understands pH, a feeding schedule and a light cycle will be fine. Neglect it entirely and it will suffer, but a single missed watering will not undo the grow.
Further Questions from South African Growers
Which medium suits it best? Depends what you are optimising for. Organic soil cut with 30% perlite and amended with bone meal, rock phosphate and kelp meal gives the fuller flavour, and all three are stocked by garden centres, agricultural co-ops and hydro shops countrywide. Coco under automated fertigation at EC 1.4-1.8 through bloom gives the bigger number. This sativa genetics performs in either.
Does it cope with real summer heat? Better than most things you could plant. An open canopy sheds heat on its own. Past 38°C you may see midday wilt, but it recovers within the hour once temperatures fall — 30% shade cloth takes the edge off the UV without costing you growth.
When do I switch to bloom feed? As soon as pistils show, not a fortnight later. The 10/80 genetics changes its demand sharply at the transition: phosphorus and potassium uptake rises while nitrogen demand falls away. Soil growers can top-dress with guano and sulphate of potash; coco and hydro growers should move to a low-N, high-PK formula immediately.
Indoors or outdoors? Indoors buys control over the 50-60 days environment. Outdoors, across a September-to-May season, gives you sunlight intensity no LED at any price reproduces, and the full up to 550 g/plant. Difficulty: easy. In flower for 50-60 days. Stands 90-120 cm. Medium. Indoors it returns up to 400 g/m2. Outdoors, up to 550 g/plant a plant.
What Hempstar Is Like to Use
The effects most commonly reported for this cultivar are euphoric, focused, relaxed. At 22% THC it sits in a bracket where there is a usable working range. Vaporised between 175°C and 185°C it lifts mood and mental energy in a way that suits creative work, a hike, or a long afternoon around a braai. The body stays light, so for anyone with a THC tolerance it holds up as a daytime option. The Terpinolene/Limonene pairing leaves a shifting profile that keeps turning up new notes on the palate.
Where it fits: creative work, company, being outdoors, and unstructured daytime hours.
The Aromatic Three
Leading with Terpinolene, then Limonene, and Ocimene underneath. Read across a cure, these three compounds do not stay in the same order. Fresh off the dry, terpinolene leads. After three or four weeks in sealed glass at 16-18°C the ocimene undertone comes up and the bouquet gains a layer it did not have at harvest. Vaporising between 180°C and 195°C captures the widest span of them — run it hotter and the volatile ocimene molecules are the first thing you lose.
Suitability and Recommendations
Hempstar is a reasonable fit for growers with the basics already in place. Understand pH, know roughly what nutrient ratios do, and be able to hold a light cycle — it will not carry you, but it does not punish the occasional slip either. Because it autoflowers there is no light cycle to manage at all, which is what makes it work on a balcony, in an out-of-the-way outdoor spot, or anywhere a timer would be one more thing to go wrong. A September-to-May outdoor season comfortably covers a 50-60 days bloom in the frost-free provinces. Posted discreetly anywhere in South Africa, with sourced grow figures shown on every strain page.
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Hempstar Auto — Breeder Information
Royal King GeneticsRecreated and stabilised by Royal King Genetics , the breeding team behind this catalogue. Seed lots are germination-tested before they ship. More on the 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 inside a tight window.
Stabilise the recessive ruderalis trait in Hempstar for uniform auto-trigger.
Chosen for clear-headed terpene expression, structural manageability and a finish that lands inside the published window.
Royal King Genetics select-mother programme — pollen drawn from an internally maintained reversed-female line.