Lucerne (Medicago sativa) is thought to have originated somewhere in north-western Iran and north-eastern Turkey. Varieties range from winter-dormant, through to winter-active lucerne.
Understanding more about lucerne
Prime vs Shedded Lucerne
Prime hay is the classification given to hay that has good green colour, plenty of intact leaf, and relatively finesoft stems. It may contain up to 10% of other plant material, such as grass, but should be free of prohibited weeds and mould, fungi, or weather damage. There is actually a grade above prime, Choice, that is more pure, and of a higher standard all around. These classifications do not specify age, but most people assume prime hay to be prime green, which is as fresh as possible (generally less than a month).