After losing a couple of skirmishes, the ants returned to devastate my peach tree, a chrysanthemum and a clump of society garlic.  They laughed at the assortment of chemicals I purchased from Walmart and Home Depot.  I’d dump Spectracide granules at the current entrance to their underground kingdom and return the next morning to a litter of ant corpses.  Meanwhile, the ants would merely transfer to another entrance and continue demolishing the greenery
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It was time to get some serious anti-ant munitions, time to visit the weapons expert of Bug Stop at 28^th Street and Thomas in Phoenix.  They stock high-end products that are effective.  Years ago, a tenant tried to start farming gourmand mice; consumer mouse baits didn’t appeal to these critters.  Bug Stop turned me on to blue blocks chock-full of grain and Warfarin.  Immediate end to mouse problem.

Once again, Bug Stop scored with MaxForce.  After two applications, the ants disappeared.  Gone. All the exits were silent.  After all the other attempts, I would find a new entrance boiling with activity.  This time there was no new entrance, no attrition, not even dead ants.

Moral of the story:  If “drugstore” brands don’t work, do some research to figure out where the pros buy bug killer/cleaning products/tools/ etc.  Then dig deep into your wallet.