While it is true that there is some form of chemical intervention that happens in order to create seedless watermelons, they are not “genetically modified” — they're actually a byproduct of very creative cross-breeding. This can be done in your home garden with a lot of work, the key is to plant both types of watermelon close to each other in order for pollination to occur.

Seeds should also be planted at a ratio of one seeded watermelon variety to two seedless ones, and they need to be kept at a minimum temperature of 70 degrees Fahrenheit. If you have done the cultivation correctly, you should have a seedless fruit harvest 100 days after the plantings begin.

If all else fails you can buy store-bought seeds to streamline the process or you can pick up seedless watermelons from the supermarket. However, it is important to note that watermelon seeds are actually nutrient-dense and contain minerals like iron, magnesium, and zinc, which do make seeded watermelons a nutritional bargain.