She started selling her work from a stall in Greenmarket Square. Prospect Park, Grand Army Plaza and the Grand Army Plaza Greenmarket. It was the first Greenmarket on a NYCHA property. Upstate farmers sell their products at Greenmarket locations. The Jackson Heights Greenmarket, a farmer's market, opens on Sundays year-round in the park. That same year, the city's first proper greenmarket became operational. Dealt on the Exchange's Contrex and greenmarket platforms are CFDs and CO2 emission certificates. The Greenmarket program manages 45 markets in the five boroughs. Greenmarket Square is a historical square in the centre of old Cape Town, South Africa.