The present invention relates to a planting adapter (101, 201, 301) comprising a planting member (102, 202) having a cavity (103, 203, 309) with an opening through which a root ball of a plant is to be inserted into the cavity (103, 203, 309), and a base plate (104, 204, 304) attached to the planting member (102, 202) for supporting said planting member (102, 202). The present invention further relates to a planting system (401) and a method for transplanting a plant.