Participates in the epigenetic repression of flowering genes in association with ICU11 (PubMed:29915151). Functions in the repression of several members of the MADS-box transcription factors family, including SEP3, during vegetative development via histone modification (PubMed:29915151). Binds 1 Fe(2+) ion per subunit. Expressed in roots, cotyledons, rosette leaves, cauline leaves, inflorescences and siliques. No visible phenotype under normal growth conditions (PubMed:29915151). The double mutant seedlings icu11 and cp2 skip the vegetative phase, flower immediatly after germination and then die (PubMed:29915151).