The vines begin to sweat liquids, which almost poetically make them seem as though they are shedding tears. The clear liquid that comes from the pruned branches, indicated that vine roots are ready with flowing sap throughout the wood vessels. This is a sign that the metabolism is reactivating natural sugars. Vines are beginning to breathe again and once again have a vital flow and exchange with its roots.
This is the beginning of Spring!
There is not one particular day in March where this process is sparked, but in general vines tend to show signs of rejuvenation around mid-March. The liquid which vines shed can vary greatly as well, and contain organic compounds such as sugar, glucose sucrose and tartaric and malic acids. Once this liquid begins to form, it will take about a month for the vines to start budding. This is then the beginning of the summer and autumn harvest!