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The aim of this study was to determine the proper root pruning time and ratio for enhancing bioactive compound formation in Agastache rugosa without plant growth inhibition. The control (without root pruning) and five treatments (1, 3, 5, 7, and 9 days of root pruning before harvesting (RPBH)) with 50% root pruning (Experiment 1) and four treatments of root pruning ratios with 30, 50, 70, and 90%...