Irish Ivy (Hedera hibernica) is an evergreen climbing plant, growing to 20–30 meter high where suitable surfaces (trees, cliffs, walls) are available, and also growing as ground cover where there are no vertical surfaces. The plant has two kinds of roots: the ordinary into the ground and a special root named rootlets which cling to the substrate.

It is not a parasite plant, but it is classified as invasive weed. It compete with the tree for soil nutrients and light, necessary for photosynthesis weekening the trees strenght. Also old trees supporting heavy ivy growth can be liable to windthrow damage. (Source-Wikipedia)

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