I pulled "ground suckers" from a bunch of my Izmir plants this year, when they were just a few inches high. If they are still in the itty bitty "seed leaf" stage though, I would bet on them being doubles. Quite a few I had unknowingly doubled when moving into trays, there were two stems, but the smaller one had yet to open its leaves when I did the transplant so a few days later it looked like they had split.