I was clearing up a corner of the Amos estate the other week where we have a few trees, the ivy had completely run all over the apple tree, (and the back fence and washing line pole), but appeared to find it very difficult to gain a hold in the holly trees. I assume that this is to do with the density of the holy foliage but with a bit of imagination you could easily see them as being in conflict with each other, two monarchs in their own realms.

Chris