A plant growing system includes a plurality of containers. Each of the containers includes a perimeter wall having an upper edge and a lower edge. The upper edge bounds an upper opening into the container and the lower edge bounds a lower opening. The perimeter wall includes a top portion adjacent to the upper edge, a bottom portion adjacent to the lower edge and a central portion positioned between the top and bottom portions. The perimeter wall has a slot therein extending downwardly into the upper edge. The slot extends through the top portion and through at least a part of the central portion. A rack for releasably receiving each of the containers is provided such that the containers are vertically aligned with each other.
