Jucker Farm: more than just a farm, more than a market–fun family outing!
QuerbeetThis is a bio fruit and vegetable delivery service. You can order a box of veggies or fuit (or a mix of the two) and choose to have a delivery once a week or every two or three weeks. You can also order single items (YES! They have kale, which is called Federkohl in German). They deliver to the Zurich area on Thursdays.
Have a look here for a list of Farmer’s Markets in Switzerland (with opening times and specialties).