Mowing trial aims to strengthen dikes and restore biodiversity |
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Delfland mows rapeseed early to reduce dominant species
The Delfland water authority is once again starting this month with mowing rapeseed on dikes near Maasland. This is the final year of a three-year pilot. Research shows that these fast-growing species negatively affect the strength of dikes.
This article was previously published on April 9, 2026 on the website of Stad + Groen.
| Rapeseed on a dike (Image for illustration, generated with AI) |
The trial began in 2024 with the aim of eventually removing rapeseed from the dikes. By mowing the plants early, they are prevented from forming seeds and spreading further. At the same time, space is created for other species, which should lead to more diverse vegetation.
Dominant species weaken dike
Rapeseed grows quickly and can reach up to one metre in height. It forms dense vegetation, leaving little room for other plants. This affects the quality of the grass cover. Due to the lack of variation, bare patches can develop. These make the dike more vulnerable to drought and erosion. Damage can also be harder to detect due to the dense foliage.
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Research shows that these fast-growing species negatively affect the strength of dikes
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First results visible
After three years of additional mowing, Delfland is seeing differences. Rapeseed seeds remain viable for about two years. Because the plants have had fewer opportunities to spread in recent years, their presence is now decreasing. The mowing is carried out using a machine with a suction function that immediately removes the seeds. This prevents them from ending up on the dike again.
Towards stable and diverse grass cover
According to the water authority, dense and species-rich vegetation is important for the stability of dikes. Different plant species together create a stronger root network and better protection against weather conditions. The pilot will be completed after this season. An evaluation will follow in 2027, when Delfland will assess whether the approach has been effective and whether additional measures are needed for sustainable dike management.
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After three years of additional mowing, Delfland is seeing differences
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