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Tsa Tsai Round Mustard is a remarkable heirloom from Southwest China that transforms the mustard experience entirely. Rather than growing traditional leafy greens, this Szechuan vegetable develops thick, tuber-like swellings along its stems, each bulging to 4-6 inches in diameter and weighing up to half a pound. The plant reaches 14-20 inches tall and matures in 120-129 days, thriving across hardiness zones 2-10 in full sun. This cool-season annual earns its nickname 'pressed stem mustard' from these distinctive bumps just below the leaf petioles, creating a texture and presentation unlike any other brassica in the garden.
Full Sun
Moderate
2-10
20in H x ?in W
—
High
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The stem swellings are the true magic here. Where ordinary mustards offer leaves, Tsa Tsai Round produces thick, bulbous protrusions that develop into substantial, meaty segments perfect for harvest. This heirloom maintains its vigor across a wide hardiness range and grows quickly enough to fit into succession plantings before summer heat arrives. The concentrated, fleshy stem structure means you're harvesting dense nutrition and flavor from a compact plant footprint.
The swollen stems are the primary harvest. They're sliced and stir-fried, bringing a crunchy-tender texture to Asian dishes, or fermented and pickled for long storage and tangy depth. The leafy portions above the stem swellings can also be harvested and used like mustard greens, making the entire plant productive. This variety particularly shines in soups where its substantial texture holds up to cooking, and in braises where the stem develops a rich, almost sweet character.
No timeline data available yet for this variety.
Start seeds indoors 4-6 weeks before your last spring frost, sowing at 1/4 inch depth in moist seed-starting mix kept at 60-70 degrees Fahrenheit. Germination typically occurs within 7-10 days. Harden off seedlings for a week before transplanting.
Transplant seedlings outdoors once they have 2-3 true leaves and soil temperatures reach 50-60 degrees Fahrenheit. Space plants 6 inches apart with 10 inches between rows. Tsa Tsai Round establishes quickly and begins developing its characteristic stem swellings within weeks of transplanting.
Direct sow seeds outdoors 1/4 inch deep in early spring as soon as soil can be worked, or in mid-to-late summer for fall harvest. Thin seedlings to 6-inch spacing once they develop true leaves.
Begin harvesting when the stem swellings reach 2-3 inches in diameter, typically 120-129 days after transplanting or direct sowing. The swollen stems should feel firm and dense to the touch, with no soft spots or mushiness. Harvest by cutting the enlarged stem segments close to the base, working progressively up the plant as new swellings mature. The leafy portions above the swellings can be harvested simultaneously and used like mustard greens. Smaller stems tend to be more tender; waiting until they exceed 4-5 inches in diameter may result in tougher texture.
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“Tsa Tsai Round originates from Southwest China, specifically the Szechuan region, where it has been cultivated for generations as a distinct vegetable adapted to cool-season cultivation. Known locally as a pressed or swollen stem mustard, this variety represents centuries of selection for the unusual stem morphology that defines it, developed by farmers seeking vegetables with concentrated texture and substance. Its journey to Western seed catalogs reflects the growing appreciation for heritage Asian vegetables and the work of seed companies dedicated to preserving non-GMO, heirloom varieties from their regions of origin.”