Fresh ginger bends the conversation towards texture. Snap a piece and you can see fibres; grate it and juice wets the board. Dried ginger powder leaves an entirely different trace on a spoon. In a Gujarati kitchen the distinction is audible as well: adu and sunth need no long labels.
For an oral history, ask which jar comes out for tea and which appears in a winter sweet. Then ask what happens when the preferred form is missing. A cook may tell you the dish would taste wrong even though both jars began with the same plant.
The example matters when reading about herbal preparations. A piece used to flavour a shared pot, a measured extract and a capsule bearing a plant name are not interchangeable descriptions. If a trial is mentioned, look for the actual preparation studied before connecting its conclusions to the ginger in your cup.
Further reading: Ginger: research and safety (NCCIH)