France is the first in producer of this variety but as they can only be sold “fresh” and cannot be harvested mechanically because of the specific characteristics of their stems, it has been gradually substituted by other easier varieties.
Currently, there are very few farmers still interested in cultivating it, which means it might disappear soon.
For more details check the link below:
https://www.fondazioneslowfood.com/en/ark-of-taste-slow-food/monstruous-viroflay-spinach