The objective of this study is to specify the characteristics of firs, beeches and pines with the DBH increment under the average in the Świętokrzyski National Park. The fir trees with the DBH increment smaller than the average were in general characterized by a parabolic or flattened top, losses in the crown regularity above 20%, and the mean relative crown length from 29% (for trees 61-80 years of age at b.h.) to 42% (for trees 81-120 years of age at b.h.). The majority of worst growing beech trees was characterized by the light part of the crown confined above 55% in an area, and the relative crown length from 45% (for trees 61-80 years of age at b.h.) to 66% (for trees 21-40 years of age at b.h.). The pine trees with the DBH increment smaller than the average were in general characterized by a parabolic or flattened top.

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