Hello everyone! We have a very old, very large (really large) Elm tree on the North side of our property. At the top of the trunk, where the limbs begin to branch out, there is a liquid coming down the side of the trunk. During the winter, it did not look necessarily wet; however, since Spring has "sprung," a steady stream has appeared. We can only surmise that this is sap coming out of the tree. What can we do to stop this weeping and save this tree? It is really huge and provides lots of shade.