Spotlight on Invasives - Spartina Anglica (Common Cordgrass)

A quiet takeover is happening in Ireland’s estuaries.

Originally introduced to stabilise mudflats, Spartina anglica has become a vigorous invader—outcompeting native saltmarsh plants and reshaping our coastal ecosystems.

Why it’s a problem:

• Dominates native saltmarsh habitats

• Converts diverse mudflats into monocultures

• Alters sedimentation, impacting birds and marine life

• Reduces vital feeding grounds for migratory waders and wildfowl

Where it’s spreading

Shannon Estuary, Cork Harbour, Wexford, Galway Bay—and beyond.

Managing Spartina takes expertise

At Wetland Surveys Ireland, we support coastal conservation projects with habitat mapping, invasive species surveys, and ecological guidance to help inform practical, science-based management—including saltmarsh restoration where feasible.

Management options (where permitted and practical):

• Mechanical removal (cutting or digging)

• Targeted chemical control (under licence only)

• Saltmarsh restoration to encourage native regrowth

Saltmarshes are vital blue carbon ecosystems—storing carbon, buffering coasts, and supporting wildlife. Protecting them means tackling invasive threats like Spartina head-on.

As part of Invasive Species Week 2025, we’re encouraging awareness, early action, and informed responses to invasive species across Ireland’s coastal zones.