There is a plant in my garden that's climbing all over 3 other (large) plants. It's not flowering but it has got dark purple pods all over it. I have no recollection of planting it but it doesn't look like a weed - but I'm thinking it might be strangling the other plants. Anybody know what it might be (I'll try and post a pic) and should I try and disentangle it to get rid of it?