I was given a sprout/3 foot section of a friends plant a month ago. It had a small root section. I planted it on the weat side of my houseand put mulch around it. I have watered it daily as we have had a hot dry summer. I have also watered it with miracid a couple times but the leaves continue to turn yellow or orange and then fall off. What am I doing wrong? I have always wanted a beautiful rhodadrendron bush and trying hard to keep it growing. Please help me.