A biodegradable plant pot is formed from a paperboard-based blank wrapped about an axis and having a first longitudinal edge portion overlapping and adhered to an opposite second longitudinal edge portion of the blank so as to form an overlap seam. The blank is oriented with the machine direction of the paperboard running substantially parallel to the axis and the cross-machine direction running substantially circumferentially about the side wall, such that the machine direction of the paperboard runs lengthwise along the overlap seam. Cuts are formed in the side wall adjacent to and at circumferentially opposite sides of one end of the overlap seam, the cuts being confined to a localized region adjacent the one end of the overlap seam. The end of the overlap seam is graspable and pullable in a direction generally toward the opposite end of the overlap seam, the cuts facilitating the starting of tearing of the blank along the overlap seam such that the overlap seam is torn from the side wall from the bottom edge to the top edge thereof.