Ants Galore

I wondered if anyone could help me with a huge problem I have in my garden - ants! Last year we noticed a big increase in the number of ants in the both the garden borders and in the lawn and this year sadly it seems we are going to have the same problem. We have both black ants and yellow meadow ants - we think due to the fact we are bordered on two sides by fields. We have lots of nests of both in the lawn but particularly meadow ants and my raised cut flower beds are absolutely teeming with both this Spring. Last year they covered young seedlings I tried to plant and seem to have infested my dahlia tubers left in over Winter this Spring. I wondered if anyone else has the same problem and/or if anyone knows of any way I can work to get rid of them at all? Any help at this point would be hugely appreciated.
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Someone sells a liquid gel poison that is evidently quite successful.. but with small kids and a dog, I have avoided poisons in my garden.
https://www.nematodesdirect.co.uk/9-no-ants-nematodes