Almost all of the Beskids is covered with spruce today - but commercial spruce, in tidy planted rows. The natural mountain spruce forest that grows here by itself has always survived only on the three highest summits – Lysá hora, Smrk and Kněhyně. At middle altitudes beech and fir prevail.
One of the three last islands of natural spruce forest lies on the summit of Kněhyně. On the steep slopes below it grow spruce-fir beech woods, while the flat summit itself is covered with stunted rowan-spruce woodsA sparse, wind-beaten mountain forest where spruce is accompanied by rowan. It grows on the highest ridges, where ordinary forest no longer thrives.. The main tree in the summit area is Norway spruce - and it is a spruce with a surviving original population of the rare mountain ecotype, a tree that has grown here for thousands of years.
What grows beneath the trees and among the stones is rare as well: the shrub rock currant and alpine currant survive in the summit zone, and a whole range of mountain herbs grows in the exposed scree. It is not one species that is protected on Kněhyně - it is the entire composition of a forest that has survived nowhere else.