Yes, the ant population seems to have exploded in the last couple years. I don't know why. Maybe mild winters but we have had numerous, serious, record-breaking cold events recently. But not this last winter for sure.
My ants are small brown ants that I believe to be Sugar Ants. They are everywhere except indoors. Oddly enough, in the past that's the only place they bothered me. These are likely the same ones Lynn has.
I use soybean meal for fertilizer in my vegetable garden. As soon as I work in into the soil I can look down and see it all walking away. Closer inspection reveals an ant under each grain of meal. What's left is food for the Finches.
I may have to get better at burying the fertilizer instead of top working it.
My Collards are now out of the woods ant-wise. If they can grow large enough the ants seem to lose interest. Along the way I lost a dozen plants. One strategy I use is water, plenty of it. These ants prefer a dry environment and seek sheltered nest sites. So I make a muddy slurry around the Brassica stems which seems to keep them from taking up residence there.
I had one Collard plant that I was trying to save from the ants. It was the last one left that was still under siege, and the ants would mass on the stem just above ground. I would come along and smash the ants off and maybe muddy up the area. Minutes later they would be back. It was basically wash, rinse and repeat. This went on for two days until I got a bright idea. I mounded some mud up around the stem to cover it and hopefully protect it from ants. Worked like a charm, immediately and permanently.
What I have learned. The ants are doggedly determined to eat/destroy the lower stem section of the plant above the roots and below the leaves. This portion is partly above ground level, partly below. Protecting this is paramount. Going forward I will plant my Brassica starts down into the soil so that the first leaf stems are buried. I think mounding soil up will work just as well. The soil around each plant is then made soupy wet on a regular basis to deter underground ant activity, and there will be nothing above ground that they want. Fortunately, Brassicas tolerate both deep planting and wet conditions.
I can see ant activity within semp plants here and there. All of their excavated soil gets pushed up in and around the plant. Easy enough to wash away. No harm, no foul... so far.