Studies were carried out on the plum collection maintained at Research Institute of Pomology and Floriculture in Skierniewice, Poland. Observations conducted in the years 2003-2005. Plum cultivars according to ripening time were divided into 5 groups: early ripening (15.07. to 31.07.), mid-early (1.08. to 10.08.), middle (11.08. to 31.08.), mid-late (1.09. to 25.09.) and late (26.08. to 20.10.). With regard to fruit weight the evaluated plum cultivars were classified as follows: very small (up to 20 g), small (21-30 g), medium (31-40 g), medium large (41-50), large (51-60), and very large (over 61 g). In the case of early ripening plum cultivars with small and middle fruits dominated. In the group of mid-late ripening time cultivars with quite big fruits pay big role. However, in the group of late ripening cultivars with small fruits (represented mostly by ‘German Prune’ types) as well as with very large fruits (e.g. cvs Empress, Oneida, President and others) were present.
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