How is it growing so fast

I planted and repotted all the seedlings of melon, beans, corn, and pepper into a tray made from mini pots, and I'm shocked that it grows so fast, especially the melon. It used to be cramped in small pots, and now it's in a huge tray

So what are you planning to do next with this seedling? Will you plant it outdoors or is this just a "botanical" experiment? 

Well, I'll plant them in large pots, water and fertilize them; the melons will grow small, it's a small variety. These beans can all be planted in one pot because they'll grow like little trees, kind of like shrubs. And I'll also put the peppers in a separate pot.

Oh, cool, I'm always thinking about growing mint). And I have few plants :(