https://goo.gl/maps/nyZQzYyGQAkKbSiZ6
https://osm.org/#map=19/43.498/3.658 <<<< Click for opening the location in Open street Maps!
Or GPS: 43°29'54.6"N 3°39'29.2"E
Try to arrive early at the farm, because there is no public transport after 7 PM.
If you want to plan your trip easily, you can check this website/download the app:
https://www.rome2rio.com/map/Montpellier/699-Cabrolous-34560-Poussan-France
From Montpellier (ST JEAN DE VÉDAS CENTRE):
From Sète: