Buad's tea is in Verdistis, in the healer's house - there's a hatch under a bed and it is in the cellar. Make sure you close the lid before you drag it into you inverntory.
Then drag it onto the tree, but make sure you have the branch and the herbs from the tree before you kill it! <img src="/ubbthreads/images/graemlins/smile.gif" alt="" /> So, if you have completed these you arew good to go.