looking lovely
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i think the acacia and the caapi might love different sun, soils and watering.
for the acacia a good drainage is important some sandy soil should do it and lots of sun.
acacia overwatering is maybe one of the biggest problems you may face.
you do not need to fertilize the acacias.
i am not sure but maybe they are big enough to prune so that they branch and grow bigger. but i am not sure about this...
I can not say anything about the caapi's