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It might be possible to follow the ants back to where they emerge from the ground. I keep sticking my spade in the ground and finding ants' nests, in my allotment. It's getting pretty annoying. Apparently one thing you can do is put borax down - apparently they take it into the nest and it kills them all off. There are also biological treatments for ants - I think it's called 'Nemasys'.
General_Strike
I don't really mind unsightly but am worried about them damaging the tree. It's pretty robust but apparently aphids could weaken it and give it diseases. The flowers are nice to look at though and there are a lot fewer of them since the aphids moved in.
I have no idea where the ants are nesting or I would! We put down wildflower turf about three and a half weeks ago which is doing very well but I suspect they may be living in that somewhere, in which case I'll never find them...