The Cedar-genus (Cedrus)
What kind of Cedar species are you dealing with.
The key between the species will follow later.
The needles can be a clue finding out what species you are dealing with. Beneath a comparison of the needles of the three species. Always to the left the Deodara_cedar, in the middle the Atlas cedar (blue variant) and to the right the cedar_of_Lebanon. As you can see the needles of the Deodara_cedar are by far the longest, Atlas cedar has the shortest needles and the needles of the cedar of Lebanon are just a bit longer than the Atlas's.
All species photographed.
Atlascedar Cedrus_atlantica
Deodara_cedar Cedrus_deodara 
Cedar of Lebanon 
