Arjan and Franco built Greenhouse Seed Company into the crown of the Amsterdam era, coffeeshop and seed bank and traveling landrace hunters all at once. Franco, gone too soon, is still quoted in grow rooms everywhere: three calyxes to a joint. Super Lemon Haze in 2008 was the peak of that run, deep into a career that had already defined an entire city’s scene. The crosses below carry their Amsterdam work forward.