Magic.
Giant beanstalks are obviously impractical for gardening purposes. There's no indication that Jack's father knew they were magic (although why, then, did they go uneaten? Distracted by crashing and flashing?), so the plant must have appeared to be a normal one. So, magic. Perhaps it's a particular cultivation technique that leads a standard beanstalk to yield special beans. Same for the goose...it had to have hatched in the standard manner, from a just-a-goose parent, but has its own unique quality. |
