I was doing floor exercises when Anne of Denmark said her father back in the late 1500s used to raise heirloom potatoes

I think she said heirloom potatoes. Jimmy McGovern would know. He wrote GUNPOWDER TREASON AND PLOT.
I got up and fled to the beach and deliberately turned my back to the ocean to let happen what might. How could anyone have a character talk about potatoes in Denmark that way?