1) I think we should start in the spring, because corn needs warmer circumstance to be grown up. Or we can start in the greenhouse, but I do not think it is good to do that, because the greenhouse is too small.
2) We could put the seeds of corn into the soil in about an inch deep and leave some space between each seed. it is better to put them in rows and columns.
3) The variety will be temperature, the amount of the water, the soil, the space, and the number of the corn. First, we can only control the temperature when the corns are in the greenhouse; otherwise, we can only choose the time to plant it. Second, the amount of water will affect the corn directly. Putting too much water into the soil will kill the corn, putting less water into the soil the corn may die, too.
4) The corn ear worms is one of the biggest problem, they will infected the corn.
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