Green House Seed Co. – The Most Awarded Cannabis Seed Bank on Earth
Founded by Arjan Roskam in the mid-1990s, Green House Seed Co. (GHSC) is a pillar of the global cannabis scene. Dubbed the “King of Cannabis,” Arjan and his team have developed some of the most legendary genetics in the game—earning over 40 High Times Cannabis Cups, 17 Highlife Cup wins, and trophies from Spannabis, Expogrow, and beyond.
GHSC is behind household-name strains like:
• White Widow – the iconic hybrid that swept cups in the late '90s
• Super Lemon Haze – 1st place High Times Cup 2008 & 2009
• Great White Shark, Arjan’s Haze #1, and El Niño – all multiple award-winners
Their catalogue features more than 20 elite strains, each bred for vigour, medicinal value, flavour intensity, and wide adaptability. GHSC seeds are non-GMO, untreated, and carefully tested across different climates and growing setups—whether indoor, greenhouse, or full sun outdoor. Many of their hybrids are known for thriving in warm regions, making them a solid fit for South African cultivators.
Beyond breeding, GHSC is known for pushing cannabis culture forward. Through their acclaimed Strain Hunters documentary series, Arjan and Franco Loja (RIP) explored remote regions to preserve rare landrace genetics and document global cannabis traditions—cementing their role not just as breeders, but cultural archivists.
Why Overgrow Stocks Green House Seeds:
Globally recognised, competition-tested genetics
Ideal for both commercial and home cultivation
Strong outdoor performance under African sun
Advocates for global cannabis legalisation and education
We import direct from source and handle each pack with care to ensure quality and authenticity. Whether you’re chasing cup-winning legends or durable hybrids for the bush, Green House Seed Co. delivers genetics with purpose, power, and pedigree.
Overgrow Grower Favourites:
Super Lemon Haze – electric sativa with citrus zest and big stretch
White Rhino – heavy indica with knockout potency
King’s Juice – a newer terp bomb with royal lineage
Green House Seed Co. remains one of the most influential names in cannabis breeding—and Overgrow is proud to bring their legacy genetics to growers across South Africa.
