Plant growth retardants like BAS, CCC, and PP 333 were tested on Phalaenopsis flowers to see how they affect growth and hormone levels in the leaves. The results showed that these treatments can reduce flower stalk height and length, and slightly impact flower size and early blooming. They also decrease gibberellic acid (GA) levels but increase abscisic acid (ABA) levels. Indole-3-acetic acid (IAA) levels were higher with the treatments, and had some connection to GA levels. Cytokinin (ZR) levels stayed higher than normal with the treatments. PP 333 at 150-300mg/L was best for flower stalk height, low GA and high ZR/GA ratio were good for flower bud formation, and high IAA levels were key in stopping stalk growth.