Posted: 04/09/2016 at 08:31
are you worried about the weedskiller spelling into the plants below? If you use the gel form of glyphosate I would have thought you would be ok. I don't know how big your buddleja is but could you put a large bag over the branches/part that you paint with gel to catch any drips?
Altrnativeply cover the plants below with something while you are putting the stuff on. If is high you won't be able to spray from the ground as it won't reach and it will all fall back onto your face. Nut cutlet is right this is a job for a ladder as you will need to get the thing completely out and repair the damage as that will also help prevent anything else taking root. It will also allow you to check if there are any other buddleja seedlings taking hold.