Xotica Komatsuna seeds, in the Spinach seeds for sale category of Seeds4Garden, comes in a 180 size that you can plant in March to get it in July.
Spinach seeds for sale
Mustard Spinach or Japanese Mustard (Brassica campsetris L. var. rapa). A fast growing leaf-cabbage, with fresh mustard taste. The plant is full of calcium. Sow from beginning of May until beginning of September. For use as spinach or salad, thin out 5 cm apart, 25 cm between rows. A more mature crop is preferable for stir frying and should be thinned out 10 cm apart with 25 cm between rows.
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Xotica Komatsuna Features
Seeds pack size: 180
Flowering Month: July
Planting Month: March