Safe to Use Herbicide to Kill Vines Climbing a Tree
The various vines seem to be working together. A big, mature Norway Spruce (I think) has English Ivy and Virginia Creeper climbing it. It is surrounded by a moat of poison ivy so I can't get to it.
Would it be safe to use weed killer to kill the poison ivy?
Which is more likely to kill the tree...spraying weed killer on neighboring plants, or letting the English Ivy grow unimpeded?
Also, could I just throw a tarp on the poison ivy to smother it, and walk over the tarp to get to the tree? Or would that suffocate the tree's roots?