tree
楰 is a rare kanji that refers to a specific kind of tree, likely the Japanese privet (Ligustrum japonicum). Its meaning is limited to this botanical sense.
楰 combines 木 (tree) with 臾, which likely contributes the sound. The character is rare and its exact historical development is uncertain.
The tree radical 木 on the left tells you this is a kind of tree. The right side 臾 can be seen as a person 人 holding something over a mortar 臼, but for the meaning just remember: 木 + 臾 = a specific tree.
For ユ, imagine you planting this rare tree: you -> ユ, and the tree grows from your care.