Early Blue Cohosh (Caulophyllum giganteum) is in the barberry family family (Berberidaceae). Across the U.S., iNaturalist users have logged 1,259 research-grade flowering observations of it in our sample, peaking in April.
Nationally it blooms mainly from April to May, but timing varies a lot by state and elevation — see the table below.
When to photograph Early Blue Cohosh: observations by month (U.S.)
About Early Blue Cohosh
Caulophyllum giganteum, the northern blue cohosh, is a species of flowering plant in the barberry family. It is native primarily to northeastern North America, where it is found in rich forests.From Wikipedia via iNaturalist — article, CC BY-SA.
Early Blue Cohosh by state
| State | Observations | Peak month | Main season |
|---|---|---|---|
| Vermont | 450 | April | Apr–May |
| New York | 282 | April | Apr–Apr |
| Ohio | 158 | April | Mar–Apr |
| Massachusetts | 109 | April | Apr–May |
| Pennsylvania | 94 | April | Apr–Apr |
| Michigan | 36 | April | Apr–Apr |
| Virginia | 27 | April | Mar–Apr |
| West Virginia | 25 | April | Apr–Apr |
| Kentucky | 16 | April | Mar–Apr |
| Tennessee | 13 | April | Mar–Apr |
| North Carolina | 11 | April | Apr–Apr |
| New Hampshire | 10 | May | Apr–May |
| Connecticut | 7 | April | Apr–Apr |
| Illinois | 6 | April | Apr–Apr |
| Indiana | 6 | April | Apr–Apr |
| Maryland | 5 | April | Mar–May |
Main season = months with at least 30% of the state's peak-month count.
Related wildflowers (barberry family)
Photography tips
- Photograph flowers on calm, overcast mornings to avoid wind blur and harsh shadows.
- Get low: a shallow depth of field (f/2.8–f/5.6) isolates a bloom against soft color.
- Stay on trails — trampling meadows kills plants and ruins next year's display.
- Try a kaleidoscope abstract of a single bloom with our online kaleidoscope tool.
FAQ
When is the best time to photograph Early Blue Cohosh?
Nationally, April has the most observations, with the main season from April to May.
Where is Early Blue Cohosh most often seen?
The most observations come from Vermont, New York, Ohio.