Hayfield Tarweed (Hemizonia congesta) is in the Sunflowers, Daisies, Asters, and Allies family (Asteraceae). Across the U.S., iNaturalist users have logged 1,946 research-grade flowering observations of it in our sample, peaking in September.
Nationally it blooms mainly from May to November, but timing varies a lot by state and elevation — see the table below.
When to photograph Hayfield Tarweed: observations by month (U.S.)
About Hayfield Tarweed
Hemizonia congesta, known by the common name hayfield tarweed, is a species of flowering plant in the daisy family, native to western North America.From Wikipedia via iNaturalist — article, CC BY-SA.
Hayfield Tarweed by state
| State | Observations | Peak month | Main season |
|---|---|---|---|
| California | 1,946 | September | May–Nov |
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 Hayfield Tarweed?
Nationally, September has the most observations, with the main season from May to November.
Where is Hayfield Tarweed most often seen?
The most observations come from California.