Selecting premium herbal tea requires a focus on botanical purity, processing techniques, and origin. Buyers should prioritize GAP (Good Agricultural Practices) certified plantations to ensure the raw materials are free from heavy metals and pesticides. Key indicators of quality include vibrant color, intact leaf/flower structures, and a natural, non-chemical aroma. For functional teas, verify the active ingredient concentration (e.g., polysaccharides in Goji or ginsenosides in Ginseng) through third-party lab reports.