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Hereâs what they have to say: âA seedless watermelon is a sterile hybrid which is created by crossing male pollen for a watermelon, containing 22 chromosomes per cell, with a female watermelon flower with 44 chromosomes per cell.espite being the new kid on the block, the seedless watermelon actually outsells its seeded peers by a significant margin. According to the National Watermelon Promotion Board, only 16 percent of watermelon sold in grocery stores has seeds. In 2003, that number was 43 percent.
All seedless watermelons are hybrids and take the longest time to mature. The seeds germinate between seven and 14 days and they must be kept between 75 and 85 degrees. It's also necessary to plant seedless watermelons next to seeded watermelons, as the hybrid varieties need a pollinator.or a healthy seedling to sprout, watermelon seeds must be planted in temperatures between 70 and 95 degrees. Position the seeds no more than 5 feet away from each other, so the seedlings have room to mature into large fruit.