A method of and arrangement for monitoring the collection of plant material comprise the following steps and means for executing these steps, respectively:collecting plant location and attribute data with respect to plant material, before and/or during and/or after harvesting the plant material；providing the plant location and attribute data on a collecting vehicle (30) adapted to collect the harvested plant material；moving the collecting vehicle (30) to the harvested plant material based on the plant location data；collecting the harvested plant material；sensing attribute data of the harvested plant material before and/or during and/or after the collecting；comparing the sensed attribute data with the plant attribute data and generating an output dependent on the result of the comparison
