(All-America Rose Selections) Q: My rosebush for years had yellow roses, but this year the roses have turned a burgundy color. Any idea why? A: That's a case of the old died-above-the-graft trick.

Abundant sunshine and mild weather in Southern ... and modern ones such as the eye-catching Ketchup and Mustard rose (red and yellow) and the yellow George Burns with its citrus-like fragrance.

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 ...