Forest Unseen,” running through Feb. 22 at at the Petaluma Arts Center, features a diverse array of large-scale works.

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

"It's very invasive it will grow anywhere, be sure where you want it, it's very hard to kill it," another commenter shared. "I'm a gardener, had some in my yard when I moved in, took me a few years to ...

Identifying a dominant leader and cutting away any competing leaders when a tree is young will allow it to grow more robustly ...

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

The Malus coronaria learned to fight frost by blooming two or three weeks later than the trees that produce cultivated ...

For more than 150 years, scientists have debated whether Prototaxites—which stood roughly 24 feet tall and 3 feet wide—were an early lichen or fungus, like a “giant mushroom” ...