I don't know exactly what you mean, but it's very possibly grape vine (a lot of people use that and it's safe).
The best resource will be Hobby Lobby or Michaels or some craft store like that, I don't know what you have in Canada. You may have to purchase your grapevine as a wreath.
Soak it in the bathtub for a few hours getting it plyable enough to unwind and manipulate into the shape you want.
Wire it together (maybe braid it) and wire it to straighter sticks while it is still pliable. Then I would bake it at 250 degrees for a couple of hours. This will sterilize it and dry it into the shape that you want.
Remove the wires before installing.