They're marked on your compass/map, if that's what you're doing wrong.
Also, Xander root is on the ground so if you're circling the tree stump near the schoolyard, stop trying to look on/in the stump and look at the ground below it.
--
Account created-9/10/04. Just a normal GameFAQs user/leprechaun
Ramza: rofl. Rofel: You say my name? -Eise