Neptune Zucchini This page first published: Mar 31, 2005 · Modified: May 9, 2018 · by CooksInfo. Copyright © 2020Neptune is an F1 hybrid zucchini with dark green skin. The plant is an open bush type. History Notes Neptune Zucchini was developed by the Joseph Harris Seed Company. During development, it was referred to as CIAGB. Released 1976.