It is a group of people who get together and send plants to each other. Usually, one person will be in charge and they will direct the order in which the trades go. The first person starts a box of plants according to what was decided on-plants, leaves, seeds and then sends that to the second person. The second person takes what they want, refills it and then sends it to the next person and on and on. It is a way to obtain new varieties and to trade excess plants.

Linda