Plant growth regulator taken up into the xylem through the leaves, stems, or roots. PaclobutrazolPlant growth regulatorFRAC 3; DMI: triazole NOMENCLATURE ... Bonzi; Cultar; Smarect; PHYSICAL CHEMISTRY Composition Tech. material is 90% pure.Mol. wt. 293.8M.f. C15H20ClN3OForm White, ... (pH 7, 10 days). APPLICATIONS Mode of action Plant growth regulator taken up into the xylem through the leaves, stems, ...