fastidious

giving careful attention to detail; hard to please; excessively concerned with cleanliness

Difficult to please; delicate to fault; suited with difficulty; squeamish; as, a fastidious mind or ear; a fastidious appetite.

Latin fastidiosus, from fastidium - disgust

“Do you know, Algy, the most expensive position in the world is a widow's." "You needn't be one very long," growled he. "I'm so wretchedly fastidious, don't you see?”

— George Meredith, Complete Project Gutenberg Works of George Meredith

“More generally, enriched media is an agar variety that is infused with the necessary nutrients required by fastidious organisms to grow.”