I dont think cross pollination is a problem. The one on the farm is alone in flowering and fruiting - though there may be other trees either wild or cultivated within 3kms, but I dont think its the problem. We do have otehr trees in the rainforest patch that would be 20ft and dont flower or fruit. The big one is on the north eastern edge of the rainforest patch, so gets more light and less competition. The ones grown semi commercially are all grown in the sun and seem to fruit and grow well. The ones up at Cape Trib fruit their heads off - Do you know their winter conditions Mike? The ones around here are used to 4-6week stretches without any rain from end of winter through mid spring. We dont call it a drought, we call it August. The only problem with the wet/dry sequence required for flowering theory is that their main fruiting seems to be mid-late winter here, and our early winter and autumn, when the flowering triggers would occur, is wet. In Cape Trib, the fruit seems to come off early dry season too, so they dont seem to rely on dry season triggers?