Are you already or still familiar with the Kasseler Strünkchen? Or the "three sisters" bean, pumpkin and maize - the ancient Mayan cultivation system? On Friday, May 21 from 5 p.m., Hessischer Rundfunk will interview agricultural engineer Catherina Merx via app in "Hallo Hessen". She presents special old varieties from the teaching and learning garden at the tropical greenhouse. The vegetable gardener gives growing tips and explains where you can get rare seeds.