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Horticulturalist: one who cultivates and manages the garden.

Environmentalist: one who is concerned with protecting the environment.

Agronomist: one who studies the science of soil management and crop production.

Biologist: one who studies living organisms.

Pathologist: one who studies and identifies diseases.

Entomologist: one who studies insects.

Or if these hats fit:

Do you love to watch healthy things grow, feel the warm tilth of the soil in your fingers, watch butterflies dance above the flowers? Do you listen to honey bees hum in the apple blossoms? Do you become one with nature as...