J. conferta ‘Blue Pacific’ – Also called Blue Pacific Shore, this slow-growing, heat-tolerant juniper has handsome blue-green ...

In order to grow properly, trees need an adequate period of warmth during their growing seasons; otherwise, the cell walls [… ...

Trees need a certain number of warm days in their growing seasons to grow properly; otherwise, the cell walls of new growth ...

Blue growth rings in woody plant stems indicate years when cells failed to lignify properly due to summers that were too cold ...

In Norway, scientists have found blue rings in trees that hint at how volcanic eruptions disrupted growth throughout history.

Learn more about these signs of summertime cold, perhaps tied to volcanic activity in 1877 and 1902.

Volcanic eruptions and cold summers leave lasting marks in the wood of northern trees, unlocking the secrets of past climate extremes.

Scientists studying pine trees and juniper shrubs in northern Scandinavia are revealing the weather of the past by looking at tree rings — which can tell us far more than just the trees’ age. ‘Blue’ ...

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 ...