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 ...

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

Blue Star' juniper (Juniperus squamata 'Blue star') is a dwarf cultivar of singleseed. The evergreen ground cover is a bit more shrub-like than other junipers, forming a dense mound that reaches ...

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.

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

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 ...