The Arabs controlled a large portion of Spain for (how long exactly?) a relatively long period of time. During which they (as I am to understand) introduced new techniques of irrigation and agriculture (such as lemons for instance).
But what impact did the Arab invasions and conquest have in the long-term for the culture of Spain? Many Jews and North Africans entered the picture during these times. What cultural influence did they have? Can these impacts be observed in Spanish culture today?
Please note that I am not talking about Latin influences (for example, the Roman Empire).