Yes, you can grow your own watermelon. Look for seeds at your local garden center or online. Once you have the seeds, plant them in well-drained soil in an area that gets full sun. Water the melon plants regularly and fertilize them every few weeks. When the watermelons are about the size of a soccer ball, it's time to harvest them. Enjoy your homemade watermelons within a few days for the best flavor and nutritional value.