Pine cones are some trees' survival tools - The Washington Post

The cones contain seeds and will release them only when conditions are good for them to create a new tree.

Native Conifers of Washington State - Wenatchee Naturalist

Gardening: It's possible for fire-damaged trees to make a comeback – Daily News

Bristlecone pine longevity and DNA

Pine cones aren't just decoration. They're tools trees use to survive.

Pine, Description, Conifer, Genus, Species, Uses, Characteristics, & Facts

Pine Cones, Pine Cones Everywhere! – Urban and community Forestry in Washington State

Washington state tree pine cone hi-res stock photography and images - Alamy

Washington state tree pine cone hi-res stock photography and images - Alamy

Pine cones are some trees' survival tools - The Washington Post