I have a large pot containing a grape vine. It is absolutely riddled with ants (haven’t done anything to move them on apart from regular watering).
Today, DP rang me to say that there were so many of them on top of the pot that you literally couldn’t see the earth. There were also many flying ants flying all over the patio area.
He said that the only thing he could think might have bothered them might be the angle grinder in the next garden - could the vibrations have affected them?
Also, will the whole colony have departed or will I find the pot just as infested, tomorrow?