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Bloom Time
Exploring & Choosing Peonies
By Bloom Time
Peonies flower once a year during the peony bloom which occurs in NW Missouri from late April through early June. In other locations peonies may flower ahead of our bloom season or flower much later somewhere else. The time of blooming depends on both the geographic location as well as the genetic programing of each variety. Some peonies bloom earlier when compared to other cultivars grown in the same geographic location. The bloom season starts with the Very Early Season sorts in the south (USDA Zone 7) This includes states such as Northern Texas, Oklahoma, and Tennessee. There, the early blooming varieties may start in March. The last domestically grown peonies finish flowering in USDA Zone 2 such as parts of Alaska by late August to early September.
7 Weeks Of Peony Bloom
| Very Early Season | Bloom Week 1 |
| Early Season | Bloom Week 2 |
| Early Midseason | Bloom Week 3 |
| Midseason | Bloom Week 4 |
| Late Midseason | Bloom Week 5 |
| Late Season | Bloom Week 6 |
| Very Late Season | Bloom Week 7 |
Bloom Period
Here in NW Missouri (USDA Zone 5b) peonies bloom from late April to early June, which equates to roughly 7 weeks. The sequence of flowering is graded into 7 distinct periods: very early season, early season, early midseason, midseason, late midseason, late season, and very late season. The calculation starts with the opening of the first flower of the season.
Bloom Week
It is calculated from the midpoint, week 4, which is defined by the bloom time of ‘Red Charm’. Each cultivar is assessed by how much earlier or later it blooms compare to ‘Red Charm’. The resulting scale is virtually identical to that of the Bloom Period model. The earliest week is 1, while peonies of week 7 are the last to flower. Bloom week notations with more than one number indicate a long bloom time which sometimes reaches across several bloom weeks.
For more information please click the hyperlink (underlined and highlighted in red color) or
simply click the image of the variety you are interested in.
