Japanese Black Sticky Corn is a striking heirloom variety that brings the sweet, waxy character of Asian street vendor favorites directly to your garden. This inky black corn earns its name from a natural genetic mutation that creates kernels with a distinctive sticky, glutinous texture when cooked, making it prized for fresh eating and traditional mochi production. Growing 7 to 9 inch ears on tall plants, it matures in 100 to 110 days and thrives in zones 4 through 11, offering gardeners a unique sweet corn experience that steams or grills into something subtly sweet and utterly different from standard yellow varieties.
30
Full Sun
Moderate
4-11
?in H x ?in W
—
High
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The real draw here is the waxy texture and inky black color that transforms as the ear matures, starting light purple before deepening to nearly black. Unlike conventional sweet corn that relies on simple sugars, this variety's sticky quality comes from a natural mutation that creates a starchy, glutinous kernel texture prized across Asia for both fresh eating and mochi production. You'll spot tall plants laden with substantial ears, each one ready to deliver a subtly sweet, complex flavor that tastes nothing like supermarket corn.
This corn shines when prepared simply by steaming or grilling, methods that highlight its subtle sweetness and distinctive waxy texture. The kernels can be eaten fresh off the cob as a delicacy, but the variety also serves traditional purposes in mochi and other sticky rice-based preparations that rely on its unique starch properties. The glutinous kernels lack the crisp sweetness of standard sweet corn, instead offering a tender, almost creamy bite that works beautifully in both Asian cuisine and creative fresh preparations.
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Direct sow seeds in warm soil after the final frost date, when soil temperature reaches at least 60 to 75 degrees Fahrenheit. Plant at the depth specified for corn, spacing seeds appropriately for the 30-inch spacing maturity requires. Corn germinates quickly in warm conditions and does not transplant well, so direct sowing is the preferred method.
Japanese Black Sticky Corn can be harvested at two distinct stages depending on your preference. For the most dramatic color and unique texture, harvest when kernels have turned light purple and are still immature, which captures the variety's signature sticky character at its peak. At full maturity, the kernels deepen to nearly black. Check ears by peeling back a small section of husk to confirm kernel color and development. The ears measure 7 to 9 inches at harvest readiness. Gently twist ears downward and away from the stalk to detach them cleanly.
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“Japanese Black Sticky Corn emerges from a long tradition of selective cultivation in Japan and across Asia, where its sticky texture has been valued for centuries in traditional cuisine and special occasions. The defining characteristic of this variety, that characteristic stickiness, arose from a natural mutation that early Japanese farmers recognized and preserved through careful seed saving. Today, it represents a living connection to Asian agricultural heritage, kept alive by heirloom seed companies and gardeners committed to preserving varieties that have fed communities for generations.”