Curious blue rings in trees and shrubs reveal cold summers of the past—potentially caused by volcanic eruptions - Peer2Peer

Curious blue rings in trees and shrubs reveal cold summers of the past—potentially caused by volcanic eruptions

Jan 21, 2025

Trees need a certain number of warm days in their growing seasons to grow properly; otherwise, the cell walls of new growth don't lignify properly, creating blue rings that appear when wood samples are dyed.

https://phys.org/news/2025-01-curious-blue-trees-shrubs-reveal.html

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