English ivy, Hedera helix, is a threat to trees, but it is a greater threat to the local ecosystem. This plant, in addition to other alien, invasive species, is becoming a significant problem in our parks and natural areas in all parts of Richmond.
When ivy encounters a vertical surface, small “rootlets” sprout from the leaf node and attach to the tree, wall , post, etc. The vine does not strangle the tree and the roots do not penetrate the bark, but the ivy does compete with the tree for water and nutrients, and heavy infestations weaken a tree. Large amounts of ivy on trees add weight making large branches or the entire tree more likely to to fall during wind events. Snow or ice are even more hazardous because accumulation on the evergreen leaves adds more weight to the tree, making failure more likely.
English ivy has two distinct phases – juvenile and adult. The juvenile form grows on the ground; as long growth continues horizontally the plant stays in this form. The adult form which will produce flower, fruit, and seed occurs only after the plant has grown up some vertical surface, which is often a tree. At this point the vine “uses” the tree to complete its life cycle, and birds will eat the fruit and then spread the seed to other locations.1. Juvenile vine 2. Mature form with flowers 3. Fruit Photo credit 1: Chuck Bargeton / University of Georgia / Bugwood.org) (Photo credit 2&3: Forest and Kim Starr / Starr Environmental / Bugwood.org)
English ivy should not be allowed to grow on trees both for the good of the tree and to prevent spread to other locations. If possible, do not allow this plant to grow on your property at all. See websites below for additional information.
Practice De Vine Intervention – remove English Ivy
Ground covers to replace English ivy