Most of the Kenai Peninsula, and most of Southcentral Alaska, is covered by what’s called boreal forest. The forests are dominated by birch, cottonwood, alder and spruce, as well as a handful of other species. That's not a huge amount of biodiversity but boreal forests are home to several different kinds of spruce trees.
On the western peninsula, it’s mostly black spruce, which are the spindly, Nightmare Before Christmas-esque conifer trees growing in wetlands. But white spruce also grow in the Kenai-Soldotna area.