Florigelia were popular in the seventeeth century. Often illustrated by eminent artists, the lavishly produced books catalogued the plants in a garden, or collected on an expedition. Who can afford to produce such a book today? A prince, of course. His Royal Highness, Prince Charles of Wales, who sponsored The Highgrove Florilegium, a collection of plants in the royal garden, and one of the most expensive books of modern times.