Vanda ‘Ratchaburi Fuchs - Katsura’ orchids, 2 - 3 years old, which flowered in the previous year, were derived from Magic Farm, Ratchaburi Province on 5 January 2014. After arrival, plants were acclimatized until 1 March 2014 in 50% shading greenhouse, average temperature of 25ºC, 70% RH and 12 h of sunlight. Fertilizers were supplied once a week by spraying. Three levels of N fertilizer i.e. 0, 200 and 400 mg/L were supplied to plant. Each treatment comprised of 100 mg/l P fertilizer and 200 mg/L K. Leaf surfactant (0.1 % Tween 20) was added to the nutrient solution. Twenty five ml of nutrient solution was supplied to plant once a week. The experimental design was completely randomized designs with 3 treatments, 10 replications per treatment; T1) N fertilizer 0 mg/L, T2) N fertilizer 200 mg/L and T3) N fertilizer 400 mg/L. Plant height (cm) and number of leaves per plant were measured once a month while inflorescence length (cm), peduncle length (cm) and flowering date were recorded during flowering stage.