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

Zones 5-9. J. procumbens ‘Nana’– This Japanese type of juniper shrub forms a dense mat of prickly blue-green needles that turn slightly purplish in winter. It grows slowly to 6-12 inches ...

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

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

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

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

Selecting Mount Iškoras in Norway for a search for blue rings, a team of researchers took samples from 25 pine trees and 54 juniper shrubs, representing the species Pinus sylvestris and Juniperus ...

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 ...