Hello Antoine Sabaross,
New Brunswick, Canada also has many rugby teams and fields. I have spoken with the NB Rugby Union, and the fields, at the moment are very beaten up since they just held the provincial championships. They are recommending three distinct fields, one adjacent to the St. John River, one behind a rural high school, and one with a rock face edge (which is highlighted with graffity). Email me with more details, and I can take some digital images for you.
Margo Flewelling, New Brunswick Film, margo.flewelling@gnb.ca