I had much greater success with my corn this year.
I planted two beds of corn and staggered the planting dates by about 60 days. Each bed is five feet by sixteen feet. The first bed was planted around May 1st and the second at the end of June.
I planted three types of hybrid sweet corn with each bed planted at the same time divided in three parts by variety. I used the "corn succession" offered by Territorial Seeds which included: Earlivee, Bodacious, and Golden Jubilee. Earlivee only grows to five feet tall and is mature within 60 days. Bodacious is seven feet tall and is mature within 80-90 days. Golden Jubilee reaches six feet and matures within 90 to 105 days.
The idea is to have a succession of corn that is "just ripe" over a period of time. It worked pretty well.
The one thing that I noticed was that the maturity time was much shorter for Bodacious and Golden Jubilee, by about 20 to 30 days.
I was pretty disappointed by the Earlivee and don't know if I will plant an extra early variety like that again. The stalks only grew to about three and a half feet tall. The ears were very small -- around 6 to 8 inches. In contrast, the Golden Jubilee and Bodacious were six to seven feet tall with 12 inch ears and two to three ears per plant.
What I don't know is how much of the growing environment affected the Earlivee. The bed is on a slight downward slope. With the drip lines ending at the bottom of the decline, the Bodacioius and Golden Jubilee might have gotten more water, affecting performance. Also, I don't know if the soil quality was better on the down slope -- but I doubt it.
A lot of the ears had been invaded by corn ear worm. You can see what the damage looks like. This is easily remedied by just cutting off the damaged portion of the ear since it doesn't affect the taste or aesthetic of the remainder. I had dusted the plants early on with Bt Dippell Dust, which is an organic product, but apparently that was not enough.
The other thing that I found challenging was knowing when the optimal time was to pick the corn. If you wait too long, it starts to get starchy. The experts say that a ripe ear has a small amount of greenish silk where the silk meets the husk, with the remainder of the silk being brown and dry. That's pretty good advice. You can see what the brown silk looks like in the top photo. This year, it was raining a ton over the two week period of time when the corn started to ripen, and the rain did a number on the corn silk making it difficult for me to really evaluate whether the silk was brown and dry because the corn was ripe or because of the rain.
Some additional advice if you are just starting with corn, plant at least three or four rows together to ensure proper pollination. Corn is wind pollinated, and if there are not enough plants together, there is no guarantee that you'll have good pollination leaving voids where kernels should be. I planted three rows in a five foot wide bed with each plant about 1.5 feet from each other in the rows. That's pretty tight and may have impacted how tall the plants got. I watered regularly with the drip lines and applied Garrett Juice every two weeks for an added boost.
Some more advice, boiling the ears for only 2.5 minutes seemed perfect. I harvested right before eating. I also harvested some in the morning and immediately refrigerated the ears for that night. The second you harvest the corn, the sugars start to turn to starch, so don't wait long to eat them, unless you are going to refrigerate them for later that day.
Here are some photos of the corn at 30 days and 60 days.
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