Master Gardeners are very important in helping Extension deliver horticultural information to local citizens. The theoretical framework of the study reported here was based on Houle's Typology. The purpose was to develop an understanding of adult motivations to participate in the Florida Master Gardener program. The sampled population was 613 adult Master Gardeners, with a total response rate of 86.78%. Participants felt a Competence-related Curiosity had "much influence" on their participation in Master Gardeners. Developing an understanding of adult motivational orientations will assist practitioners to alter the program to best meet the needs of Master Gardener participants. (Contains 6 tables.)