I happened to remove a tree by mistake, I didnt notice it until after some time, and the .esp was already saved. How do i correct that?

it doesnt seem to help pressing "del" on the tree (in the details of the mod), maybe it's me who doesnt understand how to use that function

Help me Obi-wan kenobi, you're my only hope!

Are you using the editor, you said that you were pressing "del", if so, I couldn't delete at first either, but I ran it as admin (vista....) and it worked perfectly.

It doesnt seem to help (Win7, x86). Ignore flag is never turned on for anything. I've tried as admin, and also in compability mode.

Load your esp in TESAME or Enchanted Editor, then delete the tree from the list of objects. (you'll find it in the 'Statics' section)

(deleting the tree will revert it back to it's original state)

Thanks Pluto, i'll try that