This is an update to my Mystery plant . . . and this is supposed to keep the moles away?! post.
Lorraine from the Kumbula Indigenous Nursery has identified the plant. She wrote:
This plant is called Bryophyllum proliferum or “Green Mother of Millions”. It comes from Madagascar and is highly invasive in South Africa. It will root from even a broken piece of leaf and it produces baby plantlets along the edges of the leaves that fall everywhere and grow. I planted a couple of them in my garden in the Eastern Cape 4 years ago and I have been trying to get rid of the young plants for the last three years! It certainly did not discourage the moles or the molerats (which may be what you have). The plants are also poisonous to livestock. The plant has escaped from gardens in the areas around Durban, PE, Cape Town and most of Gauteng and is fast becoming an alien invader species. If you decide to grow it, make sure that any stems or leaves that you may cut off in the future are burnt, not sent to the rubbish dumps where they will get a chance to spread into the countryside. Such a pity as it makes a lovely shrub with pretty flowers.
So I will be removing the plant again. I know my neighbour meant well, but I don’t want to knowingly grow any alien invasive species in our garden.
Thanks Lorraine for the comment and information!