Antelopehorn Milkweed (Asclepias asperula) is in the Dogbane Family family (Apocynaceae). Across the U.S., iNaturalist users have logged 2,502 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 Antelopehorn Milkweed: observations by month (U.S.)
About Antelopehorn Milkweed
Asclepias asperula is a species of milkweed native to the Southwestern United States and northern Mexico. Its common names include antelope horns, green-flowered milkweed, and spider antelope horns.From Wikipedia via iNaturalist — article, CC BY-SA.
Antelopehorn Milkweed by state
| State | Observations | Peak month | Main season |
|---|---|---|---|
| Texas | 1,963 | April | Apr–May |
| Oklahoma | 246 | May | May–May |
| Utah | 114 | June | May–Jun |
| Arizona | 86 | May | Apr–Jun |
| New Mexico | 45 | May | Apr–Jun |
| Colorado | 25 | June | May–Jul |
| Nevada | 19 | June | May–Jun |
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
Narrowleaf Milkweed
Spreading Dogbane
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 Antelopehorn Milkweed?
Nationally, April has the most observations, with the main season from April to May.
Where is Antelopehorn Milkweed most often seen?
The most observations come from Texas, Oklahoma, Utah.