natasia demetriou

Vampires and gardening don’t seem to share much in common — but don’t tell that to British comedian Natasia Demetriou. Demetriou, who stars as Nadja in FX’s vampire mockumentary “What We Do in the Shadows,” is also co-hosting “The Big Flower Fight,” a reality competition series premiering May 18 on Netflix. “It is a bit …