Fern ID: Sensitive Fern

Photo of Sensitive Fern sterile frond

Once you've stored a few search images in your mind's eye, Sensitive Fern (Onoclea sensibilis) can be spotted nearly year-round, the exception being if there is deep snow pack, like we had the winter of 2014-15. During the green season, look for this fern's distinctly lobed blades. After a frost kills back these sterile fronds, looks for the thin, brown-topped fertile fronds, which stand as convenient flags for fern observers. The fertile fronds persist throughout the white season to release their spores in spring. Sensitive Fern is often found in wetlands, like swamps, and on the edges of ponds and streams. (To view the following images in full-size, click here.)

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