design: A Dovetail Omni-C proximity-ligation library was prepared from Neptunia oleracea leaf tissue for chromosome-scale scaffolding. Chromatin was fixed, digested with DNase I, end-repaired, and proximity-ligated to capture 3D genomic contacts. The resulting Omni-C Hi-C library was sequenced on an Illumina NovaSeq platform to support long-range genome assembly.