One of the smaller Rhubarb plants is doing very poorly. You can see it in the foreground here.
I thought had a rotted crown. It certainly didn't grow back as vigorously as the other two main plants. And since I chopped off its flower stalk it seems to be suffering.
I'm sad about it, but since the other two plants are growing so hugely well, don't mind so much if this one dies I guess. There probably isn't room for all of them in the bed if the larger two keep getting bigger next year!