Last year’s Flatbush Junction Youthmarket. Photo by Avi GlicksteinAfter a successful two years, a youth-run greenmarket will return to the Flatbush Junction area on Saturdays from July 11 through November 21. The Flatbush Junction Youthmarket — one of five youthmarkets in Brookyn — will be held from 8:30am-3pm at Flatbush