Limestone Adder's-tongue
Ophioglossum engelmannii
Last reviewed: June 2026
Light
part shade
Water
medium
Size
2"–8" H × 2"–6" W
Bloom
May, Jun
Native to
AL, AR, AZ, FL and 18 more states
Browse plants for this ecoregion
Limestone adder's-tongue is a tiny, unusual fern that produces a single small leaf and a distinctive spore-bearing stalk in late spring. This diminutive native grows only 2-8 inches tall and prefers partially shaded areas with consistent moisture. It goes completely dormant in summer, disappearing until the following spring.
In an HOA neighborhood
Limestone Adder's-tongue takes more care to keep looking intentional in a front yard. Maintenance level: low. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Extremely small and can appear as weeds
- Completely dormant most of growing season
- May be mistaken for lawn weeds when present
Wildlife value
As a fern, this species does not attract pollinators but provides habitat for small soil organisms and adds to native plant diversity in woodland gardens.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Does Limestone Adder's-tongue fit your yard? Open it in Pollinator Patch to check it against your sun, soil, and HOA-conscious filters.