a labeler for labeling plastic containers in the blow mold in a rotary blow molder , with a blow wheel having arranged thereon a plurality of blow molds with a lowerable blow mold bottom , and at least one label dispenser used for providing tubular labels . the blow mold bottom is implemented such that a label can be introduced via the blow mold bottom into the blow mold before the blowing process takes place , which facilitates a spatial separation of the label supply from the feeder star wheel of the blow wheel and allows a substantially simultaneous insertion of the label and of the preform .