Smilax

The climbing thorny vine plant with flowers and berries is Smilax. This plant is also called greenbrier. It can grown and invade other plants. They can grow quickly during Winter as the seeds are robust and animals tend to feed on them. Their flowers are greenish white and their berries are either black or red. Greenbriers have rhe ability to grow tightly as thorny walls and shelters for animals, small creatures and birds.
Food from Smilax is used in medicine and beer. Despite the herbal qualities of breenbrier, it's considered a weed and cut away by many gardeners. The thorns of a greenbrier will be sharp and unpleasant. The smilax plant would treat a number of issues with the stomach including nausea and period pains.

Such a ferocious weed with climbing abilities is a provider also of food and medicine. It features in stories of legend too. The princess Briar Rose, falls in a sleeping spell and only the curse cab ever be lifted when a prince kisses her. She's been alseep for so long that the entire castle is overgrown in dense greenbrier thorns.
Also a story of tagic love. A mortal man named Crocus falls in love with a beautiful wood nymph called Smilax. He's turned into a saffron flower and his love, Smilax becomes the thorny greenbrier weed.