Cobwebby Thistle (Cirsium occidentale) is in the Sunflowers, Daisies, Asters, and Allies family (Asteraceae). Across the U.S., iNaturalist users have logged 2,253 research-grade flowering observations of it in our sample, peaking in May.
Nationally it blooms mainly from April to July, but timing varies a lot by state and elevation — see the table below.
Conservation status (iNaturalist): G3G4.
When to photograph Cobwebby Thistle: observations by month (U.S.)
About Cobwebby Thistle
Cirsium occidentale, with the common name cobweb thistle or cobwebby thistle, is a North American species of thistle in the sunflower family.From Wikipedia via iNaturalist — article, CC BY-SA.
Cobwebby Thistle by state
| State | Observations | Peak month | Main season |
|---|---|---|---|
| California | 2,178 | May | Apr–Jul |
| Nevada | 53 | June | Jun–Jul |
| Oregon | 22 | May | May–Jun |
Main season = months with at least 30% of the state's peak-month count.
Related wildflowers (Sunflowers, Daisies, Asters, and Allies)
black-eyed Susan
Common Yarrow
White Snakeroot
Chicory
Lawn daisy
Philadelphia fleabane
Pearly Everlasting
Blue Mistflower
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 Cobwebby Thistle?
Nationally, May has the most observations, with the main season from April to July.
Where is Cobwebby Thistle most often seen?
The most observations come from California, Nevada, Oregon.