The study of paclobutrazol (PBZ) application for reduced plant growth and water use in potted marigold (Targetes erecta cv. Antigua Yellow) was investigated. The experimental design was Completely Randomized Design (CRD) with 4 levels of PBZ 0, 50, 100 and 200 mg/L by drenching at 30 mL, 3 times. The result found that the PBZ application decreased plant growth. Increasing of PBZ concentration decreased plant dry weight, canopy width, total leaf area and compactness index. The PBZ application at 200 mg/L showed the best result for suppress plant growth when compared with PBZ free treatment (control). Nevertheless, increase PBZ drenching brought to the reduction of crop evapotranspiration (ETc) and crop co-efficient (Kc). However, the diminishing of growth by PBZ also reduced plant water use efficiency (WUE). The Kc value of potted marigold were ranged between 0.57-1.99 by slightly increased through each growth stages, reached a maximum at flowering and decelerated again when reached the senescent stage.