Abstract: According to the present invention there is provided a stackable and nesting plant-growing container system for a growing medium. The system includes a first growing medium unit and a substantially identical second growing medium unit. The first and second units are each of a unitary construction and includes a sidewall. The sidewall includes an inner side and an outer side, a top edge and a bottom edge. The sidewall includes at least one primary lobe extending from the cross-sectional circumference of the sidewall and uniformly increases in diameter as its distance from the bottom edge of the side wall increases and terminates in the top edge and arranged with an outwardly curving inner side extending outside the growing medium units.