Those rules actually endangered rare species because they are meant to look different (purple pottatoes), and therefore you can't sell them.
Yeah right.
So which EU countries are the biggest producers of these purple praties for sale and consumption in the EU which they can't sell in the EU?
Which non EU countries are the biggest exporters of these purple spuds to the EU where they can't sell them?
If you want a purple potato go to a decent greengrocer