How do you know that "pumpkin honey" was made with nectar from pumpkins?. I'm always skeptical of claims of pure <insert name of tree or flower> honey. Unless you are following each bee to see where they go, it's a dubious claim. Sometimes you can tell by a distinctive taste, smell, or color of the honey that it contains at least some nectar from particular plants, but even if your hive was sitting in the middle of a giant pumpkin patch, you can't know that it's really pumpkin honey.... as far as I know.