I'd say they're early.

That could be no problem, and it could mean they're under some kind of stress. Many plants will force blooms when they are stressed, as a self-protective reflex.

I've never had any Panicum bloom this early. It will be at least 5-6 weeks before any of mine do.

Thanks. I just wish they'd put that energy into leaves right now.

I'm not sure what is causing it, the plants look very full and healthy, are growing well and are planted in nice deep sandy loam in full sun. A choice spot. Must be the weird weather. We were so hot in April until mid May (in the upper 80's and 90's) but the evenings were cool. There are a few others around the city and I have NEVER seen them bloom until late August or early September.

Just weird.