In the last few decades, vegetable production in greenhouses has been more and more presented within the national agriculture. On small agricultural holdings, in aforementioned form of protected production area, dominate the tomato, cucumber and pepper growing. However, in recent years, beside vegetable crops, flowers are more and more grown (seedlings and cut flowers), where on the territory of Pančevo city, in cut flowers production calla lily becomes particularly interesting to producers. In paper are presented some specificities in cucumber and calla lily production in greenhouse, with the main goal to easily determine (according to contribution margin analysis in the cut flowers (calla lily) and cucumber production) in which line of plant production can be expected achievement of potentially better financial results. All, for analysis, necessary data were obtained from the small family agricultural holdings located at the territory of Pančevo city (within the Metropolitan area Belgrade - Novi Sad). After analytical calculations based on the variable costs have been made, it can be concluded that producers may generally achieve better production results within the calla lily production.