Once the peonies (Pfingstrosen) had sprouted and flowered in Spring, we cut the ones growing in the bed off the front door back lest they take too much water from the lavender and other neighbours. A few weeks ago, however, another one emerged, well out of season. 
Renewal buds develop in the summertime underground, becoming stems with primordia, anlage differentiating but remaining dormant, normally. We watched this one outlier grow and waited and waited for weeks to see what would happen. Has anyone else experienced this? Being this far out of sync seems to suggest something. It did finally bloom, but while we were away on vacation and the strong winds destroyed it right away.