Rhododendron's won't bloom

I have several three year old multoides rhododendrons that will not
bloom.  They are about three to four feet away from the east wall of my
garage so they get plenty of morning sun, filtered through a few oak
trees.  They are in a bed with azaleas, which do just fine, hydrangeas,
which also do well, and a couple of large mountain laurels.  They have
plenty of space.  I mulch with shredded leaves, water more or less
conscientiously, and feed them with an organic fertilizer.  The foliage
looks good except for some feeding damage, we think from rabbits.  Any
ideas why the things won't bloom?
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