I am having a difficult time explaining mission based evaluation for a volunteer program. I know it has to do with volunteer that believe in the goal and objective of the organization. The problem is I do not know how to give and example of a volunteer program for a gardener.

2 answers

Start by stating the overall goal of the whole volunteer program. Then state the goal of the gardener within that program.
Some gardeners volunteer to help city people, especially kids, cultivate small areas of donated land to grow their own vegetables.

Here are some other ideas.

http://franklin.osu.edu/topics/master-gardener-volunteer-program

http://mg.msue.msu.edu/