Rijkswaterstaat is testing a novel approach to control the invasive Japanese knotweed along the Amsterdam–Rhine Canal by using pigs to disturb the plant’s roots. Since January 2025, five pigs have been deployed at the Noordersluis in Nieuwegein to nibble on the above‑ground parts and, more importantly, to dig up the deep root system that makes the plant difficult to eradicate. The pigs’ rooting activity loosens the soil, exposing roots and creating gaps for other vegetation. Early observations show open patches and exposed roots where previously the area was densely covered. The goal is to reduce the knotweed to a non‑dominant level, allowing native species to re‑establish and improving biodiversity. The pilot is monitored for safety, animal welfare and effectiveness.
Source: Rijkswaterstaat
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