I read recently that you can tell a lot about the quality of a wine by what grows between the vines. Apparently most wine growers use a lot of herbicides to kill any greenery and the idea is that associated bugs go away as well. This helps with the yield but probably has other less healthy side effects for the wines themselves.
There is a growing move towards organic wine growing in the south of fence where the use of herbicides and insecticides is discouraged. Every french supermarket has its "Bio" aisles and Ste Maxime has its own Bio Supermarket beside Weldom with a full range of Wines grown this way.
The pic below was taken close to Plan De La Tour and to me at least it looked like a pretty nice mix of vines and the local flora and fauna.