Xotica Mizuna seeds, in the Mustard seeds for sale category of Seeds4Garden, comes in a 4000 size that you can plant in March to get it in July.
Mustard seeds for sale
Mizuna or Japanese Salad (Brassica rapa subsp. Nipposinica var. Japonica). The origin of Miquna is Chinese and it is called Xiu cai. The plant has attractive long shaped, toothed leaves. Can be used fresh in salads or for stir frying. Sow outdoors from mid April until the end of August. Plant out 25 cm apart, 40 cm between rows. You can harvest the mizuna after 6-8 weeks, cutting off the leaves just above the soil.
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Xotica Mizuna Features
Seeds pack size: 4000
Flowering Month: July
Planting Month: March