The flowers in van Gogh’s “Irises” (1889), which was the most expensive painting sold at auction at the time when it fetched $53.9 million at Sotheby’s in 1987, were never supposed to be blue, they ...

Dwarf iris Scientific name: All dwarf irises are in the Iris genus Zones: 3 to 9 Light needs: Full sun, but some varieties tolerate partial shade Preferred soil: Well-draining soil—bulbs do not like ...