fat roots - ficus
My ficus tree bonsai has some roots that can be seen above the surface of the soil. This year, for some reason, the roots swelled to become disproportionately fat. (They kind of look ugly frankly.) They look like ginseng roots that are oversized for the plant.
What may have caused this? I know the plant is due for repotting this coming spring and I did fertilize with miracle grow over the summer. Could one of these things be a cause?