Fed my young Rhubarb some compost with a sprinkling of coffee grounds on top (to deter slugs). They're growing fast. The red looks even more brilliant against the black stuff.
I realize now that my rhubarb has overcome whatever was causing the yellowing leaves the first year I grew it. I looked back through all the photos and only saw the yellowing in the first year. It was on my mind every other year but the photos prove there were just bug-chewed holes and then the usual autumn demise- no yellowing disease. Whether its because I remembered to feed it compost regularly, or cleared out all the weeds, or the plant just got stronger I don't know. But I'm glad it doesn't seem to be sick anymore!