In article , Nick Maclaren
writes

I don't know why it has never been domesticated. It is a neolithic
food plant and, as we agree, is in no way inferior to spinach as a
food crop. Most pseudo-spinaches are very coarse, but it isn't.

Isn't good-king-henry a recognised potherb? And you can buy seeds of it
from some of the veg suppliers.
--
Kay
"Do not insult the crocodile until you have crossed the river"