My newly planted "Pow Wow White" were smashing. Note the "were". I was out putzing the other evening and noticed some dead branches on two of the four plants. I'm wondering if coneflowers don't like moister soil - I had sprinklers put it about a month ago and stlll trying to figure out the best watering schedule. I'm not really sure that's the problem, but it's the only think I can think of that is out of the ordinary. I put my finger into the soil, and it was moist, but not wet, but I'm not sure how moist is too moist for coneflowers - ? .