Can I spray for poison ivy that has grown in my pampas grass in the early season when the grass is just sprouting or can I spray in there at all without losing my pampas grass?
The best way to remove Poison Ivy is to pull the plant up.
The roots go deep on this weed, so it is difficult to get all of it.
Any chemical that you use will also kill the Pampas Grass.
Here is an article that has more information.