What is Hempstar?
Hempstar is a classic Sativa-dominant hybrid born from a three-way cross of Jack Herer, Four-Way, and Skunk #1. With THC in the 14-18% range, Hempstar prioritizes terpene complexity and psychoactive longevity over raw potency — it is the kind of strain veteran growers and aficionados return to for its hashy, incense-like aroma and clean, glass-clear cerebral high. Royal King Seeds offers feminized Hempstar genetics in our regional shops with full germination guarantee.
Reported effects
Hempstar starts with a fast, energetic head rush that morphs into a sustained creative buzz lasting 2-3 hours. Users report sharp focus, music appreciation, and elevated conversation — making this a hallmark "wake-and-bake" or social Sativa. The relatively moderate 14-18% THC ceiling makes it more forgiving than modern 28% chemovars, suiting both occasional and regular consumers.
These are consumption effects reported by growers and consumers for this cultivar. Nothing here is medical advice or a claim that this plant treats, prevents or relieves any condition.
Growing Hempstar
Hempstar is for growers willing to wait. The 10-11 week flowering stretch is long, but vigorous growth and Sativa stretch (1.8-2.2x) reward SCROG, SOG, or topping training. Indoor: keep canopies open, run 18°C nights to maintain trichome integrity, EC 1.4-1.8. Outdoor: plant early in long-season Mediterranean climates; harvest mid-to-late October. The Sativa structure benefits from selective lower-third defoliation. Mold resistance is moderate-to-good. Expect 400-500 g/m² indoors and up to 700 g per plant outdoors when grown in living soil with proper amendments.
Frequently Asked Questions
What are the parents of Hempstar?
Hempstar is a 3-way cross of Jack Herer × Four-Way × Skunk #1, designed to combine cerebral Haze lineage, hashy Skunk terpenes, and structural vigor.
Is Hempstar a high-THC strain?
No — Hempstar tests at 14-18% THC, which is moderate by modern standards. It prioritizes terpene complexity and effect duration over peak potency.
Does Hempstar grow well outdoors?
Yes, Hempstar does very well in Mediterranean and mild temperate climates with long warm finishes, yielding 500-700 g per plant outdoors.
Compiled and reviewed by the Royal King Genetics team · August 2026. Lineage is the parentage we worked this line from; where a cultivar originated with another breeder, that history belongs to them, not to us. Spotted something wrong? Tell us and we will correct it.
More on the breeding protocol: how a seed line is developed.