Markfordelete only deletes it from your CURRENT savegame. If you delete something and load a save you made a second earlier, the tree you just deleted will still be there. It won't actually delete it forever and ever, it dosn't work that way. The reason for using markfordelete is to reduce savebloat since it actually deletes the ref. from your current save (and all further saves you make on that char) while disable only "hides" it from plain sight. Use markfordelete if you want to remove something forever and ever in your CURRENT save and obv. make a save before you actually remove anything.
