Vegetable testers soughtNorth Dakota State University is looking for 200 families to test promising radish, spinach and other greens from across the world. The radish varieties come in an array of colors ranging from red, purple and white. There is even a watermelon radish that has pink flesh inside. NDSU is testing the most popular greens from Asia. These greens come in many shapes and colors. They taste mild and are popular when mixed in salads or lightly cooked as stir fries.