This is the asparageous equivalent of battery chickens – cover your asparagus mounds with plastic (black on one side to warm them up, white to cool them down) and sell it to folk who want their asparagus while there’s still snow on the ground.
A slight exaggeration, but I get ours from Weils in Finthen. It’s a bit out of the way, but they’re one of the few farmers around here who place value on growing the stuff naturally.
It does make for interesting lines.