When you see corn tassels no ears forming on your plants, pollination or stress failure caused the problem. Your tassels made pollen but that pollen never reached the silks on your ears. Without pollen landing on each silk strand, no kernels can form and you get barren or sparse cobs at harvest time.
I dealt with this problem in my own garden a few years back and had to figure out what went wrong. My corn plants looked healthy with tall stalks and big tassels waving in the breeze all summer long. But when I peeled back the husks at harvest, I found almost no kernels on any of the cobs. After some research, I traced my issue to a heat wave that hit right during pollination time.
Corn pollination failure happens when tassels and silks fall out of sync or when stress disrupts the process entirely. Your tassels release pollen for about two weeks after they emerge from the stalk top. During this same window, silks must push out from the ear and catch that falling pollen. Any break in this timing means empty cobs at the end of the season.
Several common factors lead to corn not producing ears even when plants look healthy otherwise. Heat above 86°F (30°C) kills pollen before it can do its job of making kernels. Drought stress makes silks emerge late or not at all since the plant focuses on survival instead. Single-row planting means wind blows pollen away before it lands on silks nearby.
Each silk strand connects to one kernel spot on the cob inside the husk. Pollen must land on each individual silk for that kernel to develop into a full plump kernel. If even half the silks miss their pollen, you get a cob with patchy bare spots all over it. If most silks miss, you get almost nothing at all to show for your work.
You can try hand pollination to save a crop when you spot problems early in the process. Shake tassels over a paper bag in the morning to collect fresh pollen from your plants. Then dust that pollen onto the exposed silks by hand with a small brush or your fingers. This works best when you catch the issue within the first week of silk emergence from the ears.
Preventing barren corn stalks starts before you plant your seeds each spring season. Use block planting with at least 4 rows so wind can spread pollen in all directions to nearby silks. Water your corn deeply and steadily to keep silks pushing out on schedule throughout the season. Time your planting so the critical two-week pollination window misses the hottest part of summer.
Watch weather forecasts during tasseling time in your garden each year. If a heat wave comes, water your corn twice daily in early morning and evening to cool the plants down. Shade cloth can also help protect pollen during extreme heat if you catch the timing right and set it up over your plants quickly.
Nitrogen shortage can also cause this problem in some gardens. When corn runs low on nitrogen during its growth spurt, it may produce tassels but fail to develop ears at all. Watch for yellow lower leaves as a warning sign and side-dress with extra nitrogen right away.
Check your silks daily once they start emerging from ear tips on your plants. Healthy silks look fresh and sticky which helps them catch and hold pollen grains from tassels above. Brown or dried silks mean pollination time has passed for that ear. Move on to the next ear and note the timing for next year so you can plan better.
Read the full article: Growing Corn: 9 Key Steps for Sweeter Results
