Leaf Mustard
Japanese Giant Red Mustard is a stunning heirloom Brassica that brings both visual drama and bold flavor to the kitchen. Its large purple-red leaves deliver a sharp, almost garlic-like mustard punch that transforms stir-fries, pickles, and cooked greens into something unforgettable. Ready to harvest in just 40 days, this frost-hardy variety thrives in cool seasons and tolerates partial shade, making it surprisingly flexible for spring and fall gardens. The leaves grow large and tender, striking the perfect balance between ornamental appeal and culinary satisfaction.
Partial Shade
Moderate
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?in H x ?in W
Annual, Perennial
Moderate
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The defining characteristic here is that intense, sharply flavored mustard taste with almost garlic-like notes, combined with the visual impact of deep purple-red foliage that catches the eye in any garden bed. It matures remarkably fast at 40 days, yet the large leaves develop full flavor and tender texture. As a frost-hardy heirloom, this variety performs beautifully in cool-season gardens where many tender greens would struggle, and it genuinely improves with light frost exposure.
Japanese Giant Red Mustard shines in stir-fries, where its tender leaves and sharp flavor become the star of the dish. The leaves are equally excellent boiled or braised, their peppery bite mellowing slightly with heat while maintaining character. This variety also excels as a pickling green, where its crisp texture and bold mustard flavor hold up beautifully through the brining process and mature with wonderful complexity in storage.
Start seeds indoors 4 to 6 weeks before your desired planting date, sowing at a depth of 1/4 inch. Seeds germinate in 5 to 8 days when soil temperatures are between 50 and 75°F. Transplant outdoors once seedlings have 2 to 3 true leaves and the outdoor soil temperature reaches at least 50°F.
Harden off seedlings gradually over 7 to 10 days by exposing them to increasing amounts of outdoor light and air movement. Transplant after the last spring frost (or 6 weeks before the first fall frost for fall crops) when soil is workable. Space plants 12 inches apart to allow the large leaves room to develop fully.
Direct sow seeds 1/4 inch deep in the garden as soon as soil is workable in spring, or 8 to 10 weeks before your first fall frost. Sow seeds thinly along rows and thin seedlings to 12-inch spacing once they reach 2 inches tall.
Begin harvesting outer leaves once the plant is 4 to 6 weeks old and leaves are large enough to handle, typically 40 days from sowing. Pinch or cut individual outer leaves at the base, allowing the center to continue growing for repeated harvests. Alternatively, harvest the entire plant at ground level for a single, abundant cutting. Leaves are ready when they've developed their full color and size; they should feel crisp and tender, not wilted or overly mature.
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