The Date Palm Trees located in Sea of Oblivion when usage for botany level two. The tree only will be selectable at the very base of the object and half way up it is no longer target-able for use.

Step 1 : have Botany level 2.
Step 2 : highlight Date Palm tree at eye level.

Suggestion : Try to have the entire model become targetable

When you want to learn Botany for quest and searching for the teacher on the quest tab, you do not see a link. I dont know If this direct or just a missing link/line there.

i personally like the fact that u cannot target the whole tree. it makes the tree look like part of the scene if u do not know that it can be harvested.