Red ants

We are plagued with red ants! At present we are digging out some lawn to create a new planting bed and we have found numerous nests. Is there anything other than ant powder that we can add to the soil when planting our new bed? We dont want our new plant roots destroyed by the ants! Any suggestions please?
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https://www.nematodesdirect.co.uk/9-no-ants-nematodes
Hope that helps
I've panicked and put down ant powder but now feeling guilty as we get a lot of birds in the garden (now I know why)! Any solutions to kill ants (not just chase them around)?