Naktuibouw (Netherlands Inspection Service for Horticulture) inspects and monitors the fruit tree rootstocks constantly in order to guarantee the highest possible quality. Janssen Brothers Nurseries sources its propagating materials from VNL (Propagation Nurseries - The Netherlands). They supply the basic materials for continued propagation thus forming the basis for all new stoolbeds.


All plant material complies with the most stringest requirements imposed for Naktuinbouw certification. Janssen Brothers Nurseries fruit tree rootstocks are also supplied with a Naktuinbouw-certified virus-free tag. This authenticity tag is unique worldwide and guarantees the rootstock's origin and varietal purity, and that it is free of any viruses.