The present invention concerns a method for improving the growth characteristics of plants by increasing activity in a plant of a YIPPEE-like polypeptide or a homologue thereof. One such method comprises introducing into a plant a YIPPEE-like nucleic acid or variant thereof. The invention also relates to transgenic plants having introduced therein a YIPPEE-like nucleic acid or variant thereof, which plants have improved growth characteristics relative to corresponding wild type plants. The present invention also concerns constructs useful in the methods of the invention.