Around 35 volunteers from the Castlecliff Coast Care group gave up their Sunday morning to work on the sand dunes near the Duncan Pavilion, buckets and spades in hand.
The group planted 900 pingao, a coastal sand dune plant that helps to hold the sand in place.
Progress Castlecliff Coast Care co-ordinator Graham Pearson said it was the first of three community planting days.
"The [Whanganui District] council opened up sand to fill a manhole and we did a deal with them - they bought the plants and we said we would plant them so it was a community buy-in to stop the sand blowing away like buggery."