To become a master gardener, you must participate in and pass a Master Gardener program at a university or university extension. Extension master gardener programs are available in most states and involve certification via an exam after you complete the required courses. Each state and county has specific requirements for training, volunteer service, and community involvement for its master gardeners. Upon graduation, you commit to using your horticulture skills in accordance with the program’s guidelines. Most program qualifications specify an ongoing volunteer commitment in the community to retain standing as a master gardener. Continuing education is also a common requirement for prolonging your certification.