In article ,
Jeff Layman wrote:
On 28/02/17 01:17, Adam Aglionby wrote:

You have probably saved the trees by cutting through the vines, but it
may still leave them disfigured. ...

Vanishingly unlikely in the case of the birch, and not all that likely
for the rowan. Ivy is not a serious threat to healthy, vigorous trees.


Regards,
Nick Maclaren.