Mizuna are popular Japanese salad greens. With a mild mustard flavour and a crisp texture when young.
They are very easy to grow and thrive through the cooler months.
Harvest leaves as you need, allowing the plant to grow more. A great little 'cut-and-come' addition to your patch.
By Kingfiser - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=39147327