Zea mays This open-pollinated popcorn is the best popcorn we've ever tasted: buttery and delicious. Incredibly green and healthy 8' plants with very long dark green leaves set two 4ï¿½€ï¿½6" stocky ears per stalk, with 26ï¿½€ï¿½28 rows (occasionally 22) of fat creamy white kernels. 102 days. Sow seeds outdoors 1" deep post-frost. For good pollination and full ears, plant in blocks of 3-6 rows instead of one long row. Thin seedlings to 8" apart. Corn is a heavy feeder and does best in well-drained fertile soil with plenty of water.