It is good you are not allowing the mulch to pile up tight around the tree. I don't know about where you are, but here in America, we have ants that will use the mulch as a home while they eat into the trees. They can kill the trees.
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Hi Fern, I’m im Cape Town South Africa. Luckily we don’t really have an ant problem in the western cape but if in other provinces like kwazulu natal they have white ants and they eat everything. Grass, wood, leaves they can really only use compost, any organic material not broken down would just be eaten and encourage them to focus on your plant like you said. Thanks for reply. Followed