Interesting idea, but I’d want to see how the plant extracts hold up on a chip. Some herbs release acids that could corrode copper, and the pigment might fade if the humidity changes. A small trial—brew a crude dye, dip a copper trace, then watch it for a week—would be a safer start. Also, keep the roots away from any solder, they might turn into a surprise electrolyte. If it works, we’ll have a living ink, but if it doesn’t, we’ll still have a new recipe for tea.