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Corn Seeds, Japanese Black Sticky
Description
(Zea mays) Sweet Corn. Japanese black sticky corn is a unique variety cherished in Japan for its sweet, waxy texture, often used in mochi or savored fresh. Its "sticky" quality results from a natural mutation, and the corn exhibits a striking inky black hue, turning light purple when harvested immature. It is commonly steamed or grilled to enhance its subtly sweet flavor, with roadside vendors across Asia offering baskets of steamed sticky corn. The plants grow up to 6.5 feet tall and produce one to two ears, each 7 to 9 inches long with 12 to 15 rows of glossy black kernels at full maturity.
- 100-110 days to maturity
- Full sun
- Sprouts in 7-10 days
- Soil Temperature: at least 60 F for planting
- Seed Depth: 1-2"
- Ideal Temperature: 75-80 F
- Plant Spacing: 12"
- Plant Height: 6.5'
- Frost Hardy: No
Growing Tips, Tricks and FAQs
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​.
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​​.
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
- 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​.
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