Four ears of Japanese Black Sticky Corn on a white background.
Japanese Black Sticky Corn showing multiple colors.
Japanese Black Sticky corn close-up
Corn Seeds, Japanese Black Sticky
Corn Seeds, Japanese Black Sticky
Four ears of Japanese Black Sticky Corn on a white background.
Japanese Black Sticky Corn showing multiple colors.
Japanese Black Sticky corn close-up
Corn Seeds, Japanese Black Sticky
Corn Seeds, Japanese Black Sticky

Corn Seeds,
Japanese Black Sticky

4.510 ReviewsSKU: #CN190Min. seed count: 75
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Description

(Zea mays) Sweet Corn. Japanese black sticky corn is a delectable sweet, waxy-textured corn used to make mochi or eaten fresh as a sweet treat in Japan. The "sticky" quality of this corn is thanks to a natural mutation. This inky black variety can be harvested immature when the kernels start to turn light purple. The ears are best steamed or grilled for a subtly sweet flavor. Across Asia you will find roadside vendors tending baskets brimming with steamed sticky corn. Plants produce tall vigorous stalks up to 6.5 feet, averaging one to two ears 7-9 inches long with 12 to 15 rows of beautiful, glossy black kernels at full maturity. The origin and history of sticky corn are steeped in mystery and mired in historical debate. This Japanese strain was originally selected from seeds brought from China around the year 1800. It is widely believed that corn was introduced to China from its native range in the Americas by Portuguese traders in the 1520s. But some historians suggest that the unusually early presence of sticky corn in China means that the crop had taken root there nearly 100 years before Columbus. These researchers believe that Chinese traders acquired corn on an expedition to Peru in the early 1400s. Ears of corn also appear to be depicted on ancient temples in India, leading some world experts to believe that Asia had discovered the Americas, long before dark-age Europe had. It has been widely debated, however, as it challenges centuries of Eurocentric historical record.

Growing Tips: To grow this corn effectively, plant the seeds in rich, well-drained soil. Full sun is crucial for the optimal growth of this variety. Since the corn is wind-pollinated, plant it in blocks or multiple rows rather than a single line to ensure good pollination. Mulching can help retain soil moisture and suppress weeds, and regular watering is essential, especially during dry periods.

Plant Details

Botanical Name
Zea mays
Life Cycle
Annual
Sun Requirement
Full sun
Days to Germinate
7–10
Days to Maturity
100–110
Planting Depth
1–2 in.
Plant Spacing
12 in.
Ideal Temperature
60°F
Frost Hardy
No

When to Grow

Plant Japanese Black Sticky corn in late spring, when soil temperatures reach about 60 degrees F, after all danger of frost is past. This variety thrives in USDA zones 4-11, making it adaptable to a wide range of climates. The corn typically takes about 100 to 110 days to mature, so plan your planting schedule accordingly to avoid frost damage during the growing season​​. If you’re not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

How to Sow and Plant

>Direct sow the seeds into the garden, placing them 1-2 inches deep and 12 inches apart. Space rows 30-36 inches apart to provide enough room for the tall stalks, which can reach up to 6.5 feet. Planting in blocks rather than rows improves pollination and, consequently, the yield. Succession planting prolongs harvest.

How to Grow

Ensure consistent moisture levels by watering deeply at least once a week. Enrich the soil with well-rotted compost or a balanced organic fertilizer before planting. As the plants grow, side-dress with a nitrogen-rich fertilizer to support their development. Monitor for pests such as corn borers and earworms, using organic pest control methods like neem oil or diatomaceous earth if needed. Regular weeding and mulching can help manage weeds without disturbing the corn’s roots​​.

How to Save Seeds

  • Corn is wind pollinated and will easily cross with other varieties (including GMO corn!). You will need at least 1 mile of isolation to avoid cross pollination. You can also use staggered timing or caging techniques.
  • Hand pick ears when fully dried on stalk. Seeds keep best if left on the ear; just remove at planting time.
  • Sweet corn seeds will remain viable for 2 years; dent corn will last up to 5 years when properly stored.

FAQ

How long does it take for Japanese Black Sticky corn to mature?

This variety typically takes about 100 to 110 days to mature.

Can Japanese Black Sticky corn be grown in containers?

Due to its height and the need for multiple plants for proper pollination, it is better suited for garden beds rather than containers.

Is Japanese Black Sticky corn drought-tolerant?

While it has some tolerance for dry conditions, regular watering is crucial for the best yield and healthiest plants.

Browse our full range of corn seeds.

Customer reviews

4.5 / 5 10 Reviews

What gardeners are saying

  • Vigorous and tall: Hardy stalks of 7 to 12 feet, unfussy even in heat and storms.

  • Many ears: Two or more ears per stalk, with side shoots producing too.

  • Chewy, filling kernels: Pick young for sweetness; mature ears are sticky and hearty.

  • Early harvest: First ears picked in July from a May sowing.

  • Not like sweet corn: Dense, waxy texture; boil or steam, as grilling dries it out.

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