Grafting has become very prevalent and important in greenhouse tomato production, and there are a couple of key reasons this is the case. Before we explore those reasons, let’s take one quick step back and discuss the basic premise of grafting. Many who are familiar with crop production are aware that most tree fruits are produced with a root system (rootstock) and above ground fruiting portion (scion) from different plants. This same principle is now carried out in many vegetative crops where two separate seedlings are produced and then joined together through the grafting process to produce one plant for transplanting. The use of grafting enables breeders to develop crop cultivars specifically for the demands of root and shoot environments and functions.