Last summer after thinning my bush a little bit, I stuck about two dozen small feijoa cuttings in community pots (with just sand & perlite) and kept them watered through the dry season. Most of them shriveled within a few weeks, but a handful still show green leaves (but not any growth to speak of). I went ahead and carefully washed the sand off this one today, which shows nice roots:
It went in the ground to be used as rootstock next year.