Ivy grows everywhere in our forests. Okay, not EVERYWHERE but anywhere humans have ventured forth into nature. It's not indigenous and there is nothing to slow it down. It climbs on trees until the tree can no longer support itself nutritionally and then is easily felled by the next strong wind. Ivy is like the corporate headhoncho of the plant world. It's shiny, evergreen and user friendly. Its graceful twining green is seductive. The next thing you know it's embedded in everything and growing over the native plants. It's difficult to remove and needs consistent effort on your part to remind yourself it can only end in tears.