Narrowleaf Milkweed (Asclepias fascicularis) is in the Dogbane Family family (Apocynaceae). Across the U.S., iNaturalist users have logged 3,084 research-grade flowering observations of it in our sample, peaking in July.
Nationally it blooms mainly from June to August, but timing varies a lot by state and elevation — see the table below.
When to photograph Narrowleaf Milkweed: observations by month (U.S.)
About Narrowleaf Milkweed
Asclepias fascicularis is a species of milkweed known by the common names narrowleaf milkweed and Mexican whorled milkweed.From Wikipedia via iNaturalist — article, CC BY-SA.
Narrowleaf Milkweed by state
| State | Observations | Peak month | Main season |
|---|---|---|---|
| California | 2,557 | July | Jun–Aug |
| Nevada | 224 | July | Jul–Jul |
| Oregon | 194 | July | Jun–Aug |
| Idaho | 57 | July | Jun–Aug |
| Washington | 52 | July | Jun–Aug |
Main season = months with at least 30% of the state's peak-month count.
Related wildflowers (Dogbane Family)
Butterfly Milkweed
Common Milkweed
Lesser Periwinkle
Swamp Milkweed
Showy Milkweed
Green Antelopehorns
Spreading Dogbane
Greater Periwinkle
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 Narrowleaf Milkweed?
Nationally, July has the most observations, with the main season from June to August.
Where is Narrowleaf Milkweed most often seen?
The most observations come from California, Nevada, Oregon.