"So, I think I found the reason the bush pumpkin seeds are so damn hard to find: They're not heirloom. They're some unstable cross"- Uno
As an ex farmer I endorse this theory based upon the evidence.
I've found more varieties mixed in.
~ 8 perfect sized pumpkins. I note they have much stronger stems than the mother bush pumpkin. Their plants tended to vine just a touch/semi bush.
2 Butternut type. (so far, I'm not harvesting just yet) Stayed true bush habit. Doubtful for carving, novelty carving at best. True bush habit.
4 of those deformed/acorn type. Large enough to carve, but odd shape will make placing odd. True bush habit
~5 DEEP dark green things. Big enough to carve, waiting to see if they're going to turn orange or not. These vined like crazy.
~6 of the spaghetti squash. Vined like mad, funky leaves and blossoms, at least twice as many rotted on the vine. Extremely unlikely to carve. (*I WILL carve one ANYWAY just because, I just suspect it'll be a thin walled fruitless effort.)
I think we're going to try some Big Moose pumpkins next year. Like a monstrous cinderella
Maybe some Atlantic giants and try to cross them as well. Atlantic giants are the largest varieties, but they tend to make undefined lumps instead of pumpkins.