Answer: Congratulations on your seedling success! Unfortunately, I really doubt you can grow a watermelon successfully in the house, but if you can acclimate your plant to being outside and plant it outdoors very soon you might still be able to get a melon. (A "fast" producer takes 74 days, but most take a few weeks longer than that.) Watermelons need lots of sun, good rich soil, and lots of water to produce melons. Your seedling will get taller and eventually start to "run" or turn into a vine. The vine needs LOTS of room to run and build strength in order to flower. Once it begins to flower it will make a number of them before it sets fruit. Once it sets fruit, you have to wait for it to ripen. Finally, since you probably planted seed from a hybrid melon, there is no guarantee that this vine will make the same quality of melon as the one you ate. But what a great project!
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