Common milkweed blooming across eastern North America in record numbers
iNaturalist Community
Native Plants
Milkweed in your yard or neighborhood right now is the only plant monarch butterfly caterpillars can eat, so every patch you spot, plant, or leave standing directly supports one of North America's most watched migrations.
Common milkweed is having a moment: more than a thousand people reported seeing it this week alone through the iNaturalist app. It blooms in mid-summer and is easy to spot with its pink-purple pom-pom flowers and broad leaves. Monarchs lay their eggs exclusively on milkweed, so the plant's abundance is closely tied to whether monarch populations recover.
Key Findings
1,176 research-grade observations of common milkweed recorded on iNaturalist in a single week
Common milkweed (Asclepias syriaca) ranked among the most observed plant species platform-wide this week
Observation spike aligns with peak summer bloom period for the species across its native range
chevron_right Technical Summary
Common milkweed is surging in citizen-science observations this week, with 1,176 research-grade sightings logged on iNaturalist. This peak likely reflects the plant's midsummer bloom period, when it's most visible and recognizable across eastern North America.
Abstract Preview
Original paper
Trending: common milkweed (Asclepias syriaca) — 1176 observations this week
common milkweed is among the most observed plant species this week with 1176 research-grade observations.
open_in_new Read full abstractAbstract copyright held by the original publisher.
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Asclepias syriaca, commonly called common milkweed, butterfly flower, silkweed, silky swallow-wort, and Virginia silkweed, is a species of flowering plant. It is native to southern Canada and much of the United States east of the Rocky Mountains, excluding the drier parts of the prairies. It is i...