Abstract: The invention refers to a method of selecting stem segments with desired characteristics and more specifically the invention refers to a method of selecting stem segments of graminaceous plants (from the Gramineae/Poaceae family), such as plants of the Saccharum spp, including sugar cane. According to an embodiment of the invention, the method of selecting stem segments, comprises the steps of identifying at least one characteristic of each stem segment by a sensor; and separating the stem segments comprising the said characteristic from those which do not comprise the said characteristic, depending on the response of said identification means; characterized in that the sensor is selected from the group consisting of a pressure transducer sensor, a capacitive sensor, an ultrasound sensor, an x-ray sensor, a magnetic sensor, and a microwave sensor.