Transcriptional repressor that regulates multiple aspects of plant growth and development through the regulation of BEL1-LIKE (BLH) and KNOX TALE (KNAT) homeodomain transcription factors. Interacts with BLH1 and BLH3. Expressed in roots, cauline leaves, shoots, flower buds and siliques. No visible phenotype under normal growth conditions. Plants over-expressing OFP15 show small rosette size, late flowering, reduced fertilization and blunt-end siliques.