According to the statements of snitch Antonino Calderone, Provenzano participated in the so-called "massacre of Viale Lazio" (December 10, 1969), during the conflict, Provenzano was injured to his hand but managed to shoot with his machine gun; Cavataio (the target of the massacre) was wounded and Provenzano stunned him with Beretta's kick, knocking him on gunshots.
After the massacre the nickname means also that Provenzano,trapped everything and where he passed "no longer grew the grass".