The paper presents the elements of growth and structure of two generative origin stands of black locust on a chernozem soil type, subtype on carbonate aeolian sand at the age of 17 (OP-1) and 39 (OP-2). Both of the stand were established with planting space of 3 × 1 m, or with 3333 trees per hectare. By height classes according to Redei et al. (2014) stands 17 years old belongs to III, and 39 year old stands belongs to IV classes. In the stand of 17 years old 1889 trees per hectare have been found, which is 54% more than the number of trees per Redei et al (2014) for the corresponding height class, and in the 39 year old stand 1600 trees per hectare have been found, or 132% more than the number of trees per R e d e i et al., (2014) for the corresponding height class. The larger number of trees in relation to model stands caused a greater volume per hectare by 34% (OP-1), or by 78% (OP-2), but also great variability of diameter at breast height and expressed biological differentiation of trees. Biological classes, allocated on the basis of height and mutual position of the crowns, indicating that trees fall behind in growth (II and III crown class) accounted for 35.3% in the stand 17 years old and 58.3% in stand 39 years old, which is consequence of the lack of tending measures. In both stands found 4.2 to 7% of the total number of trees, with the first quality of the trunk (67-133 trees per hectare). Unfavourable diameter structure of the trees with the first quality of trunk indicates a very low technical usability of black locust trees and highlights the need for adequate tending of black locust stands on chernozem.