Just a couple questions as I am a bit confused about... 1) What is the difference in composition between a good fertilizer for rhodos and azaleas versus one for hydrangeas? 2) I have a variety of combinations in close proximity to one another. I have never fertilized my hydrangeas, but have some fertilizer (pellet form) that I bought specifically for the rhodos and azaleas. Can I use it on my hydrangea? If not, what should I use? 3) I also have a 12+ foot queen elizabeth rose quite close to all 3... what happens when one throws liquid rose nourishment into the mix? On top of all that, what is the effect on my hostas?