More than 100 years ago, Swiss farmers were cultivating Dutch red clover in arable mountain areas. After three years of use, they collected the seeds of the surviving red clover plants and sowed them again in the fourth year. They thus accidentally selected an extremely robust variety. This trait is still present in the modern varieties of clover Mattenklee type. The Descriptive Variety List of the Federal Office of Plant Varieties also classifies them as very durable and has awarded them high ratings. Moreover, these varieties are characterised by excellent health.