The phrase "grape vines" refers to the plants that produce grapes. They have long, twisting stems that wrap around supports and bear fruit in bunches. Full definition
StoneGable Summer Wreath Tutorial from Stone Gable twiggy wreath + grape vine wreath + large picks + assorted small flowers + assorted frilly flowers (prudentpennypincher.com)
Whitewashed buildings, azure bays dotted with colourful boats, romantic tavernas shaded with grape vines — a luxury escape to Greece is an unforgettable holiday experience. (loveholidays.com)