The olive cultivation has a long story at Collazzone: many documents deliver notices of an oil-press in Paciliano, near Gaglietole, and jars for olive oil of Roman Age; in the middle of XV century in the main piazza Collazzone, notarial deed are drown up upon a big oil-press millstone, used as table; in Casalalta, on the beginning of XVI century, Bartolomeo Pucci, 
owner of a lot of olive-growes, committed a fresco for the Church of Santa Maria Assunta; some years later again Bartolomeo Pucci left a rich legacy to the Church, and part of it was a piece of land as olive-growe and a jar filled with olive oil; on XVIII century the Collazzone castle budget was in a "good staying" thanks to entrances from two mill, one of them oil-mill.

  
 An olive-growe crossed by a country road

   
Olive-growe on the side of a hill near Canalicchio    

Olive trees, and their branchs, were part of propitiatory usages from the farmers in the '50s, and sometimes continuing up today; farmers and other people thinks that these usages could preserves cultivations from hail and storm. 
Today there are olive-groves for a surface of about 340 hectares, with 67.000 trees and about 240 olive-growers.
The annual production of Commune is about 5.000 q.li, of whose 1.000 of "extravergine olive oil"; there are also 4 olive-mills. That olive-oil get the certification D.O.P. (Denominazione di Origine Protetta), in the district “Colli Martani”, with the variety of “moraiolo”, in high  percentage, other than “frantoio” e “leccino".

Bibliografy:

Dal testo di Rita Boini
G. Comez e F. Orsini - Collazzone - Venticinque secoli di storia - edito dal Comune di Collazzone, 1997
Collazzone - A.A. V.V. - Catalogo delle Opere d'Arte - Editore Ediart - Todi - 1999
Canalicchio e la fiaccolata - Ricerca di Paola Patoia e Tito Berti Nulli