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I have two different

I have two different varieties of watermelon and certain plants are growing faster than other plants. I was considering hybridizing them, so my question is this: will the plants continually produce male and female flowers throughout the growing season or does each plant need to be roughly the same age so that they flower at same time? Also, some of the same plant variety are emerging from the soil about 4 to 6 days after their brothers and sisters. I'm new to growing watermelons, but who doesn't love a couple slices of watermelon during the summer. Thank you for your assistance. :-)