Vines in trees are a bad thing. In the foliage vines reach out beyond the tree leaves and grab the sunlight. With sunlight cut down, photosynthesis is reduce and tree health suffers. English ivy and other clinging vines are also a problem on trunks of trees. The foliage and stems collect organic material in the form of bark and dead leaves. Dust also collects. This mixture creates soil that collects in crotches but worse builds up on the root flare of trees. Long term this creates a condition similar to trees being planted too deep in the ground. Girdling and rot can result but at the least growth and vitality are reduced.
Damage caused by vines growing on trees.