It seems like my method of making my tree .esp's doesnt work. It still replaces default trees (added by other mods) with my trees.

The way it was explained to me was that i should just go to, for example, flora_tree_ai_01 then click the file name, search for my .nif, save, do this for all Ascadian Isles trees and save the new .esp.. That way Morrowind would replace the existing trees in Morrowind with my trees and other mods that adds trees should use the default trees. My trees do not use the default file names, but Morrowind still think's its a good idea to use them instead of the default, would be good to know what im doing wrong

Maybe if the esps with other modder trees were dated after yours?