From Wiktionary, the free dictionary

grape vine (plural grape vines)

1. Alternative spelling of grapevine (any sense).

   • 1897, Charles A. Green, Green's Four Books:

     Plant a grape vine near the house.

   • 2013, R L Fanthorpe, Lionel Fanthorpe, Patricia Fanthorpe, The Watching World:

     His opponent got a grape vine on, dragged him helplessly across deep sands and changed his hold to a reversed bear hug.

   • 2014, Connie High, A Single Yellow Rose, page 37:

     Certain people resented River Oak's elimination of color distinction and grape vine gossip included retaliation toward its master's partners.