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This is a protocol to produce stable silencing efficacy and efficiency for VIGS using CymMV as a silencing vector for floral functional genomics in Phalaenopsis orchids. This protocol is established based on a method created by Lu et al. (2007), and then modified by Hsieh et al. (2013a; 2013b), Lu et al. (2012) successfully engineered a cloning vector (pCymMV-Gateway) in that the target gene fragment is simple to insert and can be manipulated with high efficiency. The silencing vector is inoculated into plants by Agro-inoculation by using Agrobacterium tumefaciens (A. tumefaciens) strain EHA105. Agro-infiltration of leaves for use in VIGS study of orchid flowers is a time saver and produces less damage to flower buds.