Transcriptional activator that acts as a positive regulator of grain size (PubMed:31830332). Binds directly to the DNA core sequence 5'-CATTTC-3' found in the promoter of MADS1, and activates MADS1 transcription (PubMed:31830332). Increases grain width via direct up-regulation of MADS1 expression (PubMed:31830332). Promotes active chromatin modification at the MADS1 locus by increasing its level of histone H3K4me3 (PubMed:31830332). In GST pull-down assay, binds specifically to histone H3K4me3, but not to H3K4me1 or H3K4me2 (PubMed:28818372). May facilitate the recruitment of effectors to mediate gene expression (PubMed:28818372). Interacts with TBP2, a subunit of the transcription initiation factor TFIID. Exhibits a speckle-like distribution in the nucleus. Highly expressed in young panicles (PubMed:28818372, PubMed:31830332). Highly expressed in axillary buds (PubMed:28818372). Expressed in leaf sheaths, flag leaves, nodes and internodes (PubMed:28818372). Expressed in roots, culms, leaf sheaths and leaf blades (PubMed:31830332). The CW-type zinc finger domain is not required for nuclear localization. Reduced plant size and grain size. Plants silencing CWZF7 exhibit defective development of awns in grains.