Introduced marram grass was planted extensively in the early 20th century to stabilise sand dunes. In this 1946 film clip, men lay sandbags to plug a breach in the sandbar at the mouth of the Whanganui River, then plant marram grass on the adjacent dunes to stop erosion.
Te whakamahi i tēnei tūemi
Archives New Zealand - Te Rua Mahara o te Kāwanatanga
Reference: Weekly Review 264. National Film Unit, 1946
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