Sweet clover has become increasingly important as a forage and green manure crop. The main objection in recent years to sweet clover is its coumarin content, identified by a sweet odor and bitter taste, making it less desirable to farm animals. When sweet clover hay spoils, the coumarin is converted into dicoumarol which is toxic to animals, especially to ruminants. When ingested this may cause internal and/or external hemorrhages.