I found a small single plant carrying fruits, of which one had shed all its seed, in our gully in 2009. I assume it had not been present more than a year or so. I removed it and disposed of all the unripe fruits. In the ten years since then I have pulled a huge number of seedlings, 100s initially, tailing off to a few per year lately. Clearly each fruit carries a lot of seed, and it has some sort of mechanism to prevent it all germinating in the first season. The similar native Marsdenia rostrata is also present, but Moth Vine can be distinguished by the whitish, densely hairy leaf underside (not quite so white in seedlings as in mature plants, but not pale green and glossy like Marsdenia rostrata).