Yellow Flag Iris is a striking wetland iris originally from Europe that has naturalized widely across North American waterways. Its bright yellow flowers are held above sword-like leaves in late spring, and it spreads aggressively along stream banks and pond margins through thick rhizomes. While beautiful, it can crowd out native vegetation and is considered invasive in many regions.
Best time to see a Yellow Flag Iris
The best time to see a Yellow Flag Iris is April–May, when about 65% of U.S. sightings happen, based on 21,426 research-grade iNaturalist observations.
Not certain it is a Yellow Flag Iris? What plant is this? walks through what to check first and the lookalikes that catch people out.
Recent Yellow Flag Iris sightings near you
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