I planted several Encore Azaleas last fall. They were beautiful a couple of weeks ago, but I see no more buds. I thought they were to bloom all summer until frost. Is there a 'rest' between blooms? There is new growth, but some leaves are beginning to yellow. Is it safe to fertilize now? I was told, once, never to fertilize during the blooming season. And, I have a standing problem with watering--how much is too much--and how often should they be watered if there is no rain? Does over, or under watering cause leaves to yellow? These are supposed to take sun, and they receive a good 2 1/2 hours per day. We do have much clay, but other soil was mixed in when I planted them. They do have good drainage.