Objectives of the research: comparison of the amount of segetic flora in agrophytocenosis of cereals in the organic farms of Lithuania and Belgium with a view to evaluation of their compliance with the requirements of good agrarian condition. Results of the research: The research revealed big differences in the amount of segetic flora in cereals of the individual organic farms in Belgium: there was 6 times difference between the average amount of segetic flora in the agrophytocenosis of cereals of the investigated farms. Similar situation was observed during the field investigations in Lithuania in 2007. Evaluation of compliance with the requirements of good agrarian condition showed that agrophytocenosis of cereals of Belgian organic farms (average amount of segetic flora 135 units/ m-2) can be considered as complying with. However the agrophytocenosis of cereals in Lithuanian organic farms (in particular in the East Lithuanian natural soil condition zone) having the excessive amounts of segetic flora (in average 329 units/m-2) should be considered as problematic in respect of good agrarian condition