![One in Four Tree Deaths in Blue Ridge Mountains Linked to Invasive Species | Smithsonian's National Zoo One in Four Tree Deaths in Blue Ridge Mountains Linked to Invasive Species | Smithsonian's National Zoo](https://nationalzoo.si.edu/sites/default/files/newsroom/hemlock_adelgid.jpg)
One in Four Tree Deaths in Blue Ridge Mountains Linked to Invasive Species | Smithsonian's National Zoo
![Foliage of the Evergreen Conifer Western Hemlock Tree (Tsuga heterophylla) with a Bright Blue Sky Background in a Woodland Garden Stock Photo - Alamy Foliage of the Evergreen Conifer Western Hemlock Tree (Tsuga heterophylla) with a Bright Blue Sky Background in a Woodland Garden Stock Photo - Alamy](https://c8.alamy.com/comp/2AFDFM7/foliage-of-the-evergreen-conifer-western-hemlock-tree-tsuga-heterophylla-with-a-bright-blue-sky-background-in-a-woodland-garden-2AFDFM7.jpg)
Foliage of the Evergreen Conifer Western Hemlock Tree (Tsuga heterophylla) with a Bright Blue Sky Background in a Woodland Garden Stock Photo - Alamy
![Tsuga mertensiana 'Bump's Blue' / Bump's Blue Mountain hemlock | Conifer Trinomial | American Conifer Society Tsuga mertensiana 'Bump's Blue' / Bump's Blue Mountain hemlock | Conifer Trinomial | American Conifer Society](https://duz1zqzp328bb.cloudfront.net/conifers/36817/_coniferGalleryImages/Bumps-blue-originator.jpg)
Tsuga mertensiana 'Bump's Blue' / Bump's Blue Mountain hemlock | Conifer Trinomial | American Conifer Society
![Tall Snow Covered Hemlock Trees With Blue Sky In The Background. Stock Photo, Picture And Royalty Free Image. Image 96011764. Tall Snow Covered Hemlock Trees With Blue Sky In The Background. Stock Photo, Picture And Royalty Free Image. Image 96011764.](https://previews.123rf.com/images/mickdonner/mickdonner1802/mickdonner180200017/96011764-hoher-schnee-bedeckte-schierlingb%C3%A4ume-mit-blauem-himmel-im-hintergrund-.jpg)
Tall Snow Covered Hemlock Trees With Blue Sky In The Background. Stock Photo, Picture And Royalty Free Image. Image 96011764.
![Tsuga mertensiana 'Blue Star' / Blue Star Mountain Hemlock | Conifer Trinomial | American Conifer Society Tsuga mertensiana 'Blue Star' / Blue Star Mountain Hemlock | Conifer Trinomial | American Conifer Society](https://duz1zqzp328bb.cloudfront.net/conifers/35621/_coniferGalleryImages/tsugamertensianabluestar-20-old-henk-09.jp.jpg)