Plants that appear blue in nature, like blueberries, are not actually blue, but rich in anthocyanins. Blue plants get their color from anthocyanins, which absorb warm colors and reflect cool ones ...

Since trees and shrubs can live for hundreds of years, identifying these blue rings allows us to spot cold summers in the past. By looking at pine trees and juniper shrubs from northern Norway ...

Overall, only 2.1% of the pine trees' rings and 1.3% of the juniper shrubs' rings were blue; the cells which hadn't lignified properly were mainly found at the end of growth rings, in latewood ...