|Pruning at the vineyard|
The grape quantity is not related with the green part or vegetable growth of the vines. If the vines have lots of fruits they will have a small size and will be really diffcult their maturation, so again, the quality will be affected.
In general, the vines can grow more than 30 meter high so from the prune we get the "sarmientos" and we will use them for BBQ as wood, they are great to cook Lamb chops (very tipycal from Rioja). Only the buds located at the end of the branches where the sap is, will be the ones that will improve, the others near the trunk will not sprout.
The prune objetive is to reduce the number of branches and the length to make the vine stronger, with a longer life and improving the quality of the fruits.