Hi Graydon, the best example of successful cultivation is at Larnach Castle, where several species have been, and are, cultivated. For Wellington, see if Otari has succeeded. Rewi might see this. Anisotome latifolia has been available as plants within the trade on a fairly regular basis. I think Texture Plants sold them for a while (most likely from seed collected from mainland-grown specimens), as did a couple of other nurseries. Undoubtedly, several people in Southland will have grown megaherbs. Jesse will know.