Answer: Some vines cling all on their own and others need some support on which to cling to. Ivy has little peds that stick like super glue. Once you have ivy growing up a wall you'll never be able to remove the little peds, even after pulling all the ivy down. Other vines need wires or a trellis on which to wrap their tendrils and keep them upright. As the plants grow they grow onto one another and eventually provide thick coverage. A thick growth of vines of any kind will help insulate a wall by keeping the sun from directly hitting the wall. Hope this answers your question.
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