sentences:  It is advised that dunes should not be restored with the planting of exotic species and managers should aim to only use species indigenous to an area, originally New Zealand used exotic, fast growing dune vegetation called marram grass to stabilize eroding sand dunes.It was later discovered that this exotic species created very high, steep sand dunes that were increasingly susceptible to New Zealand’s high storm energy climate.It also became apparent that the native New Zealand dune vegetation was out-competed by this introduced species which caused issues biologically.