27. Roses are red, but violets aren’t blue. They’re purple, you goober—get a clue. 28. Roses are red, violets are blue; I’m allergic to flowers. A-a-achoo! 29. Violets are red, roses are ...

Today, florists sell roses in a range of colours including red, purple, yellow — and even painted with blue or multi-coloured dyes. But what colour were the first roses? A large genomic analysis ...