The black wattle has been extensively planted and flourishes at elevations of from 1000 to 3000 ft.
The cultivated area may be divided into five agrarian regions or zones, named after the variety of tree culture which flourishes in them.
It is extensively distributed, but especially flourishes in the Neapolitan provinces.
In Sicily and the provinces of Reggio, Catanzaro, Cosenza and Lecce this tree flourishes without shelter; as far north as Rome, Aquila and Teramo it reqtiires only the slightest protection; in the rest of the peninsula itruns the risk of damage by frost every ten years or so.
It thus appears that co-operation flourishes most in the districts in which the mezzadria system has been prevalent.