I have to agree with James. James has a very large garden and the space to grow corn. If planted well, corn can get two to three ears on a plant and you can get a second ear or even a third if you do successive planting or plant some extra seedlings a week later just to get the tassels to last long enough to pollinate the second and third ears. You just have to remember to plant the same variety to prevent crossing. You can also bag the tassels and hand pollinate if you have a small block planting.
For most smaller gardens corn is not an economical crop. It takes up a lot of space, is a heavy feeder, and as you know you only get one ear or maybe two mature ears from each plant. There are other crops you could grow in the same space that would give you better yields.
I do grow corn in summer. I can get 3 crops in from June-September as long as I plant the temperate corn early and the tropical corn later. However, I do have to choose. My garden does not always cooperate. When I plant broccoli in the fall (I only have room for 5 plants), it does not produce until November but will make side shoots until May. Either, I keep the broccoli longer and skip the first March planting of corn or I pull the broccoli plants sooner. In the heat of summer, I can grow eggplant, peppers, tomatoes (heat resistant ), beans, sweet potatoes, ginger, okra, cucumber, squash, gourds (although it might try to take over my whole back yard not just the garden), or corn. Tomatoes, ginger, and eggplant I grow in pots outside the garden. I do grow cucumber and beans either in the garden or in one of the tomato pots. I grow gourds in another garden where they have room to sprawl or climb the fence. I don't need a lot of okra or beans and I don't like to eat them often. So, I actually have space in summer to grow corn in my main garden. It is one crop that never goes to waste since I really like corn. It may take me a week to eat it, but I will eat every one. Sweet potatoes,and tropical spinach are perennial here. Long and wing beans are almost perennial since they last a long time. The potatoes and tropical spinach sprawl and they will take over spaces and the beans will climb the plumeria tree, so I don't plant very much of them. I can usually trade calamondin, lemons or limes for them anyway. I do have wild bitter melon growing in my yard and I could probably trade them for something else as well. I plant Asian and leafy greens mostly from October-May although I can get Kale and Swiss chard to grow year round for greens, they taste better in cooler weather. I plant most of my herbs in pots although the bay leaf, Indian curry, bilimbi, and Jamaican oregano are in the ground. I haven't had any dragon fruit yet, but I was cutting it so now I have not cut it in a while, it is branching. It still tries to escape into my neighbor's yard.
Happy gardening in Hawaii. Gardens are where people grow.