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

How extreme weather leaves a lasting mark on trees and shrubs POZNAŃ, Poland — In the Arctic’s harsh borderlands, where trees ...

These rings are not just a visual anomaly but serve as natural archives of past cold summers. Researchers studying samples ...

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 ...

an unusual phenomenon etched into the rings of trees and shrubs has offered a glimpse into the Earth's climatic history. Scientists have discovered that peculiar "blue rings" in wood samples ...

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

When the cells growing in a particular year do not solidify, they create “blue rings” when the wood samples are dyed. Since trees and shrubs live for hundreds of years, studying their blue ...

creating ‘blue rings’ that appear when wood samples are dyed. Since trees and shrubs can live for hundreds of years, identifying these blue rings allows us to spot cold summers in the past.

When the going gets cold, even tough trees struggle with growing. Trees need a certain number of warm days in their growing seasons to grow properly; otherwise, the cell walls of new growth don’t ...