Xotica Mung Choi seeds, in the Mustard seeds for sale category of Seeds4Garden, comes in a 1800 size that you can plant in March to get it in July.
Mustard seeds for sale
The thinned seedlings (Brassica juncea var. rugosa) are delicious and you can take several cuttings from each plant. Use in salads and stir-fries. Sow under glass from March to September or outdoors from mid July to the beginning of September. Sow in rows 25 cm apart and thin out with spacing of 20 cm between plants.
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Xotica Mung Choi Features
Seeds pack size: 1800
Flowering Month: July
Planting Month: March