Kiwis are being urged to rid their homes of the “invasive” moth plant as soon as it makes an appearance, to stop the perennial vine from smothering native and exotic trees, Stuff reports. Northland Regional Council said moth plant is one of the region’s worst weeds. Moth plants can be identified by their white flowers, which appear in January and turn into large hanging kapok-type pods, which split open to release hundreds of seeds – poisonous to humans – with silky threads.