Is English Ivy on Trees Bad?

English ivy is a hardy perennial, capable of withstanding frost, heat and drought. Because of its decorative qualities and low-maintenance requirements, English ivy is often seen growing on buildings, borders and up trees. The plant, though often harmless, can cause damage when it overgrows its supports.

Growth Habit

• English ivy grows prolifically as a ground cover and as a vine. When English ivy grows up trees, it reaches for the same light as tree branches. Because it is so fast-growing, English ivy can out-compete tree branches, robbing the tree of necessary light.

Damage

• Uncontrolled ivy growth blocks light from growing tree leaves and in this way decreases a tree's ability to make food through photosynthesis. Ivy foliage and vines are heavy and weigh down tree branches, causing stress. A tree that is under stress is more susceptible to diseases.

Disease

• Heavy, wet foliage provides a habitat for bacteria such as bacteria leaf scorch which destroys elms and maple trees. Dense vines and foliage also provide shelter for rats, squirrels and other vermin which can burrow into tree roots and damage tree trunks, opening them up for further infestation.