We used to wait until early evening when they were all in their nest, then cut the nest off the plant allowing it to drop into a bucket of very hot water. Keep a rock handy to sink the nest to the bottom. They are nasty little things. The water should be hot enough to kill them.
Green ants will respond to a small can of kitty cat or cat sardines and 3 drops of roundup. They take the poison back to the nest and it works for about 3 months. Jan
