I presented this at a an Ohio Association of Garden Clubs Region 3 Meeting
What I came up with are these four reasons.
The first spring shoots emerging after a long winter
The Beauty - of the leaves, the blossoms, the forms, the textures, the aroma, the colors, the growing, and the changing day after day
The rewards - the vegetables, the blossoms
I love to learn. The life cycles of plants, the life of the soil, the conditions that support that life - all intrigue me. I read books about plants,organic fertilizers, pesticides, climate - any aspect that may affect my hobby.
I come to appreciate Patience. Wait for it!
Optimism. I hold to the idea that each will grow and become mature each season - and if not - wait till next year.
I learned that disappointment comes with gardening, too: When the weather, either wind, heat, cold or rain damage the garden; When the rabbits or squirrels, or dogs, or kids, or hoses or bugs wipe out a section.