Experts and BHG readers answer.
Planting Mountain Cedar sapplings
You don't mention which cultivar of cedar you have. If your trees are Cedrus atlantica (Atlas cedar), they need at least 15 feet on all sides, as they spread to 30 feet when mature. A Deodar cedar grows even larger, at about a 40-foot spread. Smaller varieties include Cedrus brevifolia and Cedrus libani (Cedar of Lebanon). Plant these about seven feet apart. "Mountain cedar" might be a folk name for another species, like Juniper. If you write back with the Latin name of the plant, we can be more specific.--Stephanie Hainsfurther