Although these pumpkin vines are amazingly prolific, every morning when you leave your bedroom, you'd swear half the pumpkins vanished over night. It's probably just the FAUNA eating them. Not that it matters, because they keep growing right back.
It wasn't always overgrown like this. When you first discovered the TRANSMATERIALIZER, you started messing around with it haphazardly. You kept appearifying pumpkins from somewhere. It was just pumpkin after pumpkin, until one time a copy of the bunny you inherited from grandma showed up, much less old and tattered of course. All that fooling around was before you realized how precious its fuel would be. Such a waste of good uranium.