A recent wedding trend popularised by Instagram has seen a noxious weed that poses a biosecurity hazard to the nation become a key element in floral arrangements.

The use of Pampass grass, a South American native weed which produces up to 100,000 seeds per plant that spread over a 25km radius, is creating fear among farmers that an outbreak of the weed may devastate their property.

Rous County Council’s Kim Curtis says the Biosecurity Act outlaws the plant in some regions of Australia, but there is still confusion among florists regarding the legality of using treated Pampass grass.