How to mass-remove Placed Objects from Skyrim?

[NomenNescio]

Short version: I have a complete list of cells copied to an .esp, and I don't want to have to go through and flag each one as Deleted individually. Is there a way to do this to all the cells in the .esp?

Long version: I'm using a replacer for a dead shrub. The replacer makes it a much prettier 3D green shrub, but Bethesda placed the dead shrub in all kinds of caves and mines, so I want to remove it from those cells. Ain't nothing green supposed to be growing in there. So I found the shrub in xEdit, copied every reference over into an .esp and removed the ones that could realistically be home to lush green flora. I'm now left with looooong list of cells each with only a few Placed Objects of these shrubs, but going through them all and changing flags individually is gonna be a nightmare. So I'd much rather see if there is a way for me to do this across every cell I've copied?