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Xie Bai is a small Allium bulb with a characteristic onion-garlic odor, but odor alone cannot distinguish it from edible Allium species or wild toxic look-alikes. The dried bulb material may be pale and fibrous and can retain soil between scales. Keep the exact species label and harvested bulb part; do not substitute garlic, onion, or ornamental Allium in a materia-medica entry. People with Allium allergy or gastrointestinal sensitivity should not experiment with concentrated preparations. A traditional pairing with Gua Lou in classical formula records does not make the combination suitable for a person taking anticoagulants or with chest pain. A bulb sample can be compared by shape, outer tunic, and aroma, but the odor is shared across the genus. Keep an authenticated plant voucher from flowering or fruiting stage, not just a bulb photograph. Avoid collecting bulbs from lawns or untreated wild plots because ornamental Allium may receive pesticides and some close relatives are difficult to distinguish. Document source, harvest date, and whether roots/tunics were removed. A recipe from a historical source is not validated for modern medicines or conditions.