HOW MUCH WATER DO MATURE VINES (OLDER THAN 3 YEARS OLD) NEED AND WILL THEY SHOW DISTRESS WHEN IT IS NEEDED?
Mature vines should only be given irrigation during extremely dry periods, & then only up to veraison (berry color change). Unfortunately; vine stress from lack of water is almost indistinguishable from other types of stress to the vine. As a general rule, when dealing with a fully mature vine, it is best to rule out all other possible causes of stress before focusing on drought.
