purpleinopp said: Hi & welcome! Are you able to add a pic of the area? Is there plastic there?
stone said: What have you tried planting?
I hadn't heard of juniper allelopathy, so I did a search.
Seems like if you've limited your efforts to scattering grass seed... Well, that wouldn't grow.
From my reading, I'd suggest figuring out some nice perennial plants to grow there...
Or plant some trees.
purpleinopp said: Butternut = Juglans.