The investigation has been carried out in young sessile oak (Quercus sessilis Ehrh.) stands of different origin: - natural stands originating from seed, - natural stands originating from coppice shoots, - artificially produced stands - plantations established by acorn-sowing. The aim of the investigation has been, based on the analysis of individual stem development, to find out what are the differences in the development of stands of different origin. The analysis of diameter, height and volume development, as well as diameter, height, and volume increments, have shown the following: 1. During the researched 30-year period, sessile oak stems of different origin have had significant differences in their development. 2. Regarding all the analysed properties, the stems produced by seed sowing (artificial origin) have had the most intensive development and, at the same ages, they have developed the largest sizes. From this statement it can be concluded that artificial stands, if treated correctly, are more productive than the natural ones. However, this conclusion should be accepted with a reserve, as the analysed stand was established on the more fertile soil, it did not grow in the shade of the old stand, the canopy was not so dense and the trees had more life space than in the other two analysed stands. 3. The development of trees originating from seeds and coppice shoots, agrees closely to the biological and productive characteristics of trees having different origin. A tree originating from coppice shoots has got very intensive growth from the beginning and reaches larger sizes than a tree of seed origin, which is less developed from the starting point. In time, this difference is diminshed, and between the age of 10 and 15, the diameter and height are equalized. After that point, the trees of seed origin have a more intensive growth. 4. At the time of diameter increment culmination, there are nor statistically significant differences between the trees of seed and those of artificial origin, but there is a difference between the trees of seed origin and those of coppice origin. 5. At the time of height increment culmination, there is only a statistically significant difference between the trees of artificial origin and those of coppice origin.
