In my pruning post and photos you can see that man are carrying wicker at their belts and tying the vines to the training wires with it. In Portuguese wicker is called “verga”.
“Verga” comes from a willow (“vergueiro”) that usually borders the properties and grows mainly on moist soils.
It is harvested once a year, by pruning time, and it is used to tie vines and other trees. It was also used to do baskets. After harvest, the “verga” is sorted by thickness and length: the thinner parts are used to tie and the thicker ones were used in basket making.
Next, “verga” packages are made and kept upright in water, so they can keep their flexibility and allow a proper use.