The work presents results of the analysis of structure and growth of Scots pine stands on sites, overgrown with phytocenoses, which are classified into syntaxonomic unit Genisto januensis-Pinetum sylvestris Tomažič 1940. The research was carried out in the mountains of Kum. Five research plots measuring 30 x 30 m were put down and the analysis of stand structure was performed. Tree composition, social, diameter and quality structure were analysed. On each plot nine thickest Scots pine trees were selected and cut for stem analysis. On that basis the characteristics of height and diameter growth were established for the analysed site unit. Using stem analyses we were able to estimate site productivity. As regards tree composition Scots pine prevails, in spots substantial shares can be held by thermophyllous broadleaves and by common beech and spruce as well. Diameter structure of stands is very close to J-distribution. Furthermore, assortment structure of Scots pine is favourable, on the contrary the quality of broadleaves is extremely low. Height growth of Scots pine starts to slow down after the age of 50 years, whereas the diameter growth is surprisingly moderate and persistent, differences between plots are rather small. The range of estimatedsite productivity is very wide. Teh stump value of trees is low, for trees with diameter at breast height below 30 cm is mostly negative.