As described by the American Horticultural Society’s web site https://ahsgardening.org/gardening-resources/master-gardeners/, a Master Gardener is an individual who received intensive horticultural training who then volunteers as a Master Gardener in their community by giving lectures, creating gardens, conducting research, and many other projects. If growing things and helping others is a passion of yours, you may be interested in the Master Gardener Program.
Visit the web site at the link above for information by locations across North America that this training is offered. The American Horticultural Society’s site also has a lot of great information on other programs related to travel, youth gardening, and internships.
The Master Gardener program is a great way to give back to others and the environment.