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Hi Anita, yes cyclamen can develop these 'floral trunks' particularly where tubers get an annual covering of leaf litter and so get a little deeper every year. In pots, the compost level can obviously drop over time as the humus/organic matter content in the compost is used up. Although I'm not sure that would adequately explain why your tubers have moved so far down in their pots!I think Adelaide has a 'Mediterranean' climate? So C. graecum should do really well for you outdoors. They can certainly be seen in Greece growing on rocky ground and among the drystone walls farmers use to terrace cultivated areas on sloping ground.