Hi
I feel abit of a fraud putting a reply as our place is only a holiday retreat and everyone else is living in Catalonia and we don't have too much knowledge about gardening at our place although at this time of year our weeds are fantastic!!!  Anyway have found this website which might give a little bit of info        www.gardeninginspain.com.
We are hoping to set up a watering system for when we are away so I will be requesting some advise at some point if anyone else has done this.
Debbie