As you consider shoulder growth and exercises, remember there are four muscles of the shoulder to be addressed: The subscapularis, supraspinatus, infraspinatus and teres minor. Be sure to take care because repetitive, intensive training routines can slowly cause injury to the shoulder.
Side lateral raises, front raises, overhead presses (dumbell and barbell), rear deltoid work...will address all muscles of the shoulder. Take care never to bring the dumbell or barbell, etc. below ear level. This will create less shoulder stress.
Trust me when I speak about injury; mine will never be the same from extremely heavy dumbell and barbell pressing. Warm up with small weight raises while lying on your side and etc. This will help (and so does ice.
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Try shoulders with back - it is an opposing muscle group.
Good luck to you.