Now is the time to destroy any missed moth plant vines, while they are clearly visible and flowering, and before the pods form or mature. Moth plant is a South American vine; invasive in New Zealand and unfortunately well-established in Northland, Auckland, Waikato and the coastal BOP. The large seed pods open over winter months to release hundreds of wind-blown seeds.
The simplest and most effective control method is to use a sharp spade and chip the vines out of the ground. Mature moth plant vines are not easy to kill with herbicide: cut the vine to within 20 cm of ground level and apply one part glyphosate to 5 parts water, plus a sticker such as Pulse, to the vine base.
Moth plant harbours passion vine hopper, slows down orchard shelter trimmers and is a poisonous plant. The sap can cause severe dermatitis, so wear gloves, protective clothing and consider eye protection.