45 days. An under-the-radar culinary gem, Mibuna is one of the lesser known of the dento yasai, or traditional heirlooms of Japan. This buttery tender and mild green makes delectable salads or is good lightly stir fried. It’s also amazing pickled. This early-to-mature and cold-tolerant green is a perfect addition to the market gardener’s repertoire. No garden should be without this world-class salad favorite!