If in a pot and you think they are nesting in there, the easiest way is to give it regular and deep waterings and they will move on. The ants will be feeding from the sugars excreted by aphids or scale insects so you need to treat those. Ants have no interest in any part of magnolia trees. If ants are present, so are the sap-sucking insects they are feeding on.
A trowel in the hand is worth a thousand lost under a bush.
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