All roses are not created equal, but just exactly how does one measure the difference? The flower industry uses a measurement to gauge the size and value of a rose that at first glance may not appear to matter to you. All roses in the wholesale flower market are rated by the length of the stem after being cut from the rose plant. This length is expressed in centimeters and common lengths are 40, 50 and 60 cm. But the important fact to remember is that the longer the stem, the larger the flower head! For example a 60cm rose might have a flower head two times the size of a 40cm rose. So the length of the stem might be really important if you are creating large arrangements, or you might think you don’t need any stem at all for a corsage, but remember it’s the size of the flower head that matters most.