Corn ear will be proportional to the size of the plant. To get big corn plants, and big ears, you needs lots of sunlight, water, nitrogen fertilizer, and warm days. Plant again starting in April and you will have a chance for good corn and the other crops you mention.

I grow chinese eggplant ,I use tomato cage for support.Most of them the grow about 40" tall.

I realize that this comes 5 years after the question was asked, but just in case someone else does a search for leaf hoppers, I'm going to post my recent discovery. These little demons killed one of our grapevines 3 years ago and came back in full force this year trying to do it to the other one. We tried everything, sprays and even white fly sticky traps. They would get on the traps but most would just flip off again. Soooo, I tried fly paper. Yes the kind that opens into a long spiral that you don't want to get too close to with your hair. LOL Within 10 minutes there was a huge amount of them stuck on all 3 that I hung out. By the time I got done gardening I could walk by the vine with no little demons flying around and hitting me like little BB's. I went out later and shook the vines and NOTHING. They were ALL on the fly paper. I'm lucky to have places to hang them from but if you don't just drive a couple of plant stakes in the ground a couple feet apart, put a string between them and hang your fly paper from the middle of the string. Voila!

Okay, the native soil at my garden is really poor (i.e. deficient in nutrients, no earthworms or microorganisms of any kind in it.....which just further proves my point that the soil is horrible). I have to constantly apply fertilizer to the plants in order for them to do well/not struggle. I will be tilling in horse manure at the end of the season to amend the soil, but I can't do that until the end of season unfortunately. A question about the tangle foot; I found something called tree tangle foot; will this work for flea beatles? I had a question about the sticky traps as well (i.e. using the tanglefoot with the cardboard). You said to place it near the plants....this may seem like a dumb question, but should I put the sticky traps in a straight row along both sides of the row where the eggplant is? Should I just place them all over the garden? How many would I need? My garden is roughly a 40' x 40'. Does the poor soil make the the veggies more prone to flea beatle infestations? I've not only had flea beatle infestations with eggplant, but also napa cabbage and pac choi as well; however the flea beatles always do the most damage with my eggplant (I had eggplant starter plants earlier in the season and the infestation was so bad that they killed my plants) I've read that you should plant trap crops, essentially acting as decoys from the plants you're trying to prevent the flea beatles from infesting. Does this trap cropping method work?