I want to buy fertilizer to make my hydrangea blooms blue. I don't want to know the chemistry, etc. That tells me nothing, since I'm neither a gander nor a chemist. I am a shrink. So, I wish the instructions would say, "Good for making hydrangeas blue" if that is so."Good for making hard earth softer," "Good for making flowers bloom," or "Good for making foliage thicker," etc.