Spruce up your yard! With cold-weather hardiness, evergreen beauty and a range of sizes and shapes, the many types of spruce ...

Ask the Master Gardener: What are blue-green growths on trees? These are lichens. Lichens are non-destructive, living organisms composed of a fungus and algae living in a symbiotic relationship.

Symbiotic fungi transform terpenes from spruce resin into attractants for bark beetles When metabolizing spruce bark, the insect’s fungal partners release volatile compounds that bark beetles ...