Baby pak choi of 5 varieties showed plant height ranged from25.1-18.7 centimeter. The treatment of chitosan was not significantly different with control and within varieties except variety, which showed the lowest plant height both in control and chitosan treatments. The canopy width showed ranging from 40.2-31.5centimeter. The treatment of chitosanwas not significant different
with control and within varieties. However, they were significantlydifferent between varieties. A and ChingChiang606 variety showed the lowest canopy width. Leaf number ranged from 23-14 14leaves, which A variety showed the highest leaves per plant 23 leaves. However, it was not significant different with it’s control. The yield ranged from 380.0-240.8grams per plant.Which were not significantly different between control and chitosan treatments.