Chainsaw for Cypress Knees?

Yes, but you don't want to be digging holes with a saw chain. Use a pick axe

Not a bad idea. Though, my dumb arse will miss the root and introduce that axe to my shin. Of course, the chainsaw might not be too forgiving either.

I usually go around my yard once a year with a pickax and get all of the new knees popping up. I had a huge one in my yard when i first moved in that required me digging down around each side of it and cutting it out with a chainsaw. Usually one swing of the pickax on each side of the knee with do the trick.

Sawzall