Was here on a past trip to Taiwan, and here's my YoGeeDaDee Organic Lifestyle review.
We had stayed in Jiaosi for the hot springs baths, for which this town is popular. While riding in the car, we saw a sign for "organic" (in Chinese) and made a point to stop in.
It's a friendly little place owned by a couple with kids. Besides selling packaged food stuff, they also offer food and blended drinks. Likely the only organic place in town. It's vegan friendly. No meat at all.