Planting Pumpkin seeds. Can we grow one for a contest?

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Myself and my children have planted Pumpkin seeds and we used two spot one was right in the sun and one was in a spot where it was sunny most of the day and cool later on. The one in the sun haven't even grown but the other one are growing really big in no time. I hope by Oct they will at least be a few pumpkins for my children to cut or maybe we will have a real big one to enter in a contest that would be nice.