The research was conducted in 2011-2015 in Kirov region. Three-time cutting use of trefoil-timothy mix while harvesting at branching. bud formation and flowering stages of trefoil development had been planned. Possibility of durable (up to 5 years) growing of this grass mixture has been established. https://www.nacrack.com/quick-save-PPSS-Group-Covert-Stab-Body-Armour-limited-save/