At her wedding to Jack Brooksbank on Oct. 11 at Windsor Castle's St. George's Chapel, the royal carried a crisp white bouquet with blue thistle, which contrasted the autumnal flowers that ...

5. Sea Holly Picos Amethyst This striking plant is native to the Mediterranean and has stunning blue-purple thistle flowers that are best planted in sunny borders.

When we stop to think about it, there really aren’t that many blue flowers, neither in our gardens nor in the wild. Oh yes, ...