An apparatus useful in the production of the paper pot assembly for raising and transplanting the seedlings of farm crops, said paper pot assembly comprising a plurality of cylindrical pots each having a square configuration in section. The apparatus comprises means for applying equidistantly spaced parallel lines or a wide strip of adhesive to one-half the width of one side of each flattened tube, tape-gathering means for converging a plurality of the flattened tubes thus applied with the adhesive to superpose consecutively the flattened tubes on one another in such a manner that two adjacent flattened tubes are disposed in a transversely staggered relation to one another with adjacent tubes overlapping by one-half their width. A combined regulating and guide means controls the travel of the flattened tubes and guides them into pressure rollers where the flattened tubes are adhered together while correctly keeping the staggered or overlapped relation.