That's very early corn so it may not have much height potential. And the tassel can first be seen when it's barely half final height. So it still might make 6ft. If it is a dark green and hasn't been short on water, then it should reach near it's potential height and yield.

Many sweet corns are short, some very short.

The exceptionally hot weather is making corn prematurely tassel all over the midwest. Drought stress can exacerbate it.

It has been my experience that corn which achieves at least half of its "normal" height can still make good ears as long as other conditions are good, moisture being the most critical.

I believe that extreme heat during the tassel phase can cause "blind" stalks that form no ears, I know that extreme drought or overcrowding can do this.

My corn is all doing it this year. Most of it looks like it will finish out at 5 to 6 feet,and it is beginning to show ears. So I will water and pray for the best. It will be what it will be, nothing can be done now about it.

Yeah, my aztec black (not actually a sweet corn, but still corn) didn't grow any taller than I am (granted, I'm over 6'). Was the first time I grew corn and had always heard that Elephant's Eye bit, but yeah, apparently corn just does not grow that tall. Or at least not the kind we grow.

You could fertilize once more if the corn was never fertilized to start with or if it was not given one booster feeding. I notice that my healthy corn is about 6 inches shorter than last year. The extra hot weather does make some difference.

The first two plantings were good bearing and *3 is earing up nicely and only *6 planting out of 7 plantings is less than really nice looking.

An open pollinated patch is only getting about 9 feet tall it looks like.

I did fertilize once with sweet corn alive about 3 weeks ago when the plants were about 5 inches tall so they have grown well since then, probably 24-30 inches in the last 3 weeks. And I will fertilize again soon being they are beginning to tassel.

Are the tassels sticking out of the tops, or is it just that you can see them forming? My corn put on almost again as much height while it was forming its tassels, because I remember looking at them and thinking, huh, you start tasseling pretty short. But now the plants are taller than me instad of waist high. This variety also puts out tillers that are gender confused, meaning I have these strange bits that started out with silk, formed kernels, but then kept growing and now are making male flower parts just below the kernels (which have no husk over them).

No they are not sticking out above the plant. They are still forming down inside the plant so far.