Aquatic Milkweed (Asclepias perennis) is in the Dogbane Family family (Apocynaceae). Across the U.S., iNaturalist users have logged 899 research-grade flowering observations of it in our sample, peaking in June.
Nationally it blooms mainly from April to September, but timing varies a lot by state and elevation — see the table below.
When to photograph Aquatic Milkweed: observations by month (U.S.)
About Aquatic Milkweed
Asclepias perennis, also known as aquatic milkweed or white swamp milkweed (not to be confused with swamp milkweed; Asclepias incarnata), is a North American species of milkweed that is found throughout the Coastal Plain from eastern Texas to southern South Carolina, northward along the Mississippi River, and into the Ohio Valley of Illinois, Indiana, and Kentucky. There seems to be a few disjunct populations in Arkansas, Texas, and Indiana.From Wikipedia via iNaturalist — article, CC BY-SA.
Aquatic Milkweed by state
| State | Observations | Peak month | Main season |
|---|---|---|---|
| Texas | 273 | May | Apr–Oct |
| Florida | 186 | August | Apr–Oct |
| Louisiana | 82 | April | Apr–Aug |
| Georgia | 76 | July | May–Sep |
| Mississippi | 75 | June | May–Aug |
| South Carolina | 61 | May | May–Aug |
| Arkansas | 34 | July | May–Aug |
| Indiana | 33 | August | Jun–Aug |
| Kentucky | 31 | June | Jun–Aug |
| Alabama | 17 | May | May–Aug |
| Illinois | 14 | June | Jun–Jul |
| Tennessee | 14 | May | May–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
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 Aquatic Milkweed?
Nationally, June has the most observations, with the main season from April to September.
Where is Aquatic Milkweed most often seen?
The most observations come from Texas, Florida, Louisiana.