English ivy (hedera helix) can damage mortar, but grape vines don't have holdfast structures like hedera that can sink into mortar. Plus, hedera helix is so den

English ivy (hedera helix) can damage mortar, but grape vines don't have holdfast structures like hedera that can sink into mortar. Plus, hedera helix is so dense that rotting vegetation and sheltered animals can also cause problems. Grapevines have tendrils that grab onto and twine around something like wires or a trellis.