L'Horteta de Greta is an ecological market garden in Corbera (la Ribera Baixa, Valencia) whose corn maze, built from roughly 5,000 sweet-corn and popcorn-corn plants, is described by its founder as Spain's first ecological agricultural maze. Beyond the maze, visitors can walk the fields and harvest vegetables priced via on-site QR codes, and the farm also runs guided school visits and workshops on agroecology and local history. Access is described as free, open Friday afternoons, all day Saturday, and Sunday mornings.