The leaves of Mentha pulegium were collected in
Mai 2009 at Skoura near Boulmane (90 km in the south
east of Fez. The coordinates: latitude: 35 ° 42 '21 "
longitude: 4 ° 32' 31"; altitude: 3200 m). The climate was
semi-humid with strong continental influence with an
annual average temperature of 20°C. The plants were then
isolated from the other specimen and conserved for
extraction.