术

The zhú reading appears only in traditional-medicine plant names — 白术 (báizhú) and 苍术 (cāngzhú), both Atractylodes rhizomes used in herbal prescriptions. You will see it on herb-shop labels and in TCM recipes; everywhere else 术 reads shù.

The zhú reading is actually the older botanical sense — the character originally named the atractylodes plant, which is why the tree radical sits in the graph. When the traditional 術 'technique, art' merged into 术 in modern simplified writing, the everyday shù reading took over and zhú was relegated to a handful of fixed herb names.