l creeping ivy will it kill plants and trees

Ivy has been known to strangle trees in northern Arizona, but I don't know it's entire behavior in the UK. I would worry most about young trees of slow growing species, and old, decrepit trees. Some of the more finicky perennials and bulbs may be in danger from ground covering ivy, as well.

Thank you,

yes it can kill and take over trees in the uk to but it mite not or just take a realy long time to get to the point wear its doing that.