 This bleeding occurs when the soil begins to warm and osmotic forces pushes water, containing a low concentration of organic acids, hormones, minerals and sugars, up from the root system of the vine and it is expelled from the cuts (or "wounds") left over from pruning the vine.During this period a single vine can "bleed" up to of water.Tiny buds on the vine start to swell and eventually shoots begin to grow from the buds.