Henan Garden Network Training Center. The Henan Garden Network Training Center in Zhengzhou, together with the Vocational Skills Appraisal and Guidance Center of Forestry Bureau, held a training course on the vocational qualification certification of green chemical industry (flower gardener), and you can take the green work certificate. This certificate can be used as a proof of personal qualification and salary promotion, and it is also a necessary certificate for the company to bid for the project and apply for qualification.