It's hollyhock season again.
Others are flowering.
I checked, and I had found the same kind of katydid nymphs on May 1, 2013. They were also on hollyhocks.
I only have a few hollyhock plants in my yard, and I'm pretty sure none of my immediate neighbors have them. I wonder how the katydids even find them, let alone show up with such regularity.
I guess if you eat mainly hollyhocks, you're probably pretty great at finding them.