One of my three black-eyed susans (Rudbeckia fulgida "Little Suzy") is turning brown and dying. The problem seems to be progressing from one side of the plant to the other, with the leaves and stalks turning brown and drying up. Some of the stalks and flowers seem to be wilting before they turn brown, though. I've posted a photo (4 MB) at
There seems to be plenty of air flow on that side of the plant - roughly the northeast side - and the surrounding plants seem OK. However, I lost all four beardtongues (Penstemon digitalis "Husker Red") on that side late last summer, as well as a fourth black-eyed susan, and as I recall they similarly turned brown and died.
After I took the photo, I cut away all the dead bits. I also gave it some water, as we've had several sprinkles lately but no sustained rain for a while, and the soil was dry down to a couple inches.
Any opinions and advice would be much appreciated.