06/19/2026
Over the past few months, residents and visitors to Southern Shores may have noticed accumulations of vegetation along the soundside shoreline, along with the odor that can occur as organic material naturally decomposes. On behalf of the Towns of Duck and Southern Shores, an expert from the Coastal Studies Institute reviewed samples collected from the accumulation in Southern Shores and has confirmed that the material is primarily composed of widgeon grass (Ruppia maritima), a common submerged aquatic vegetation (SAV) species found throughout the Currituck Sound. Smaller amounts of horned pondweed (Zannichellia palustris) and sago pondweed (Potamogeton pectinatus) were also identified, along with a mix of naturally occurring terrestrial plant material.
The vegetation was likely uprooted during late fall and winter storm events. Widgeon grass is particularly susceptible to storm-related disturbance because of its relatively shallow root system. Despite this, it is known to recover quickly and plays an important role in the health of the sound. Submerged aquatic vegetation provides critical habitat for fish, crabs, waterfowl, and other wildlife while helping maintain water quality. The presence of washed-up seagrass is a natural part of the coastal ecosystem and can occur following periods of strong winds and wave action.
Residents concerned about the odor may be encouraged to know that the strongest phase of decomposition appears to have passed. Experts report that most of the rapidly decomposing organic material has already broken down, and the smell should continue to diminish.
The Town recognizes that seagrass accumulations and the associated odor can be frustrating for some residents. However, experts emphasize that this is a natural process that occurs periodically in coastal ecosystems, particularly following storm events. Submerged aquatic vegetation and the wetlands it supports are valuable natural resources that provide significant environmental benefits, including improved water quality, wildlife habitat, and shoreline resilience.
