Once you find the Wild Vines you get
A Cord of Vines
Craft a Vine Braid (To the Workshop)
Rewards: 1750 coins, 6 XP
Here are the pictures for the Vine Braid.
Note to Hoarders. You can make a second Vine Braid (after you have started one craft in the workshop) by buying one more Wild Vines for 20 gems. (The Life Crystal is also 20 gems. I'm guessing the White Sand is as well, but can't verify that.)
The Wild Vines (and others) are capped at 1. So you have to decide if you want an extra Wild Vine in your inventory or an extra Vine Braid. I'm making an extra Braid. I'm guessing once I make my first Braid the craft will disappear and I won't be able to buy any vines for 20 gems. But I'll report back and let you know.