The results presented in this WSU publication serve as a general guide for evaluating the feasibility of growing greenhouse seedless watermelon transplants, both non-grafted and grafted, as well as using grafted transplants to produce seedless watermelon in Washington as of 2014. This publication is not intended to be a definitive guide to production practices, but is helpful in estimating the physical and financial requirements of comparable plantings. Transplants are grown by commercial nurseries, as well as some watermelon producers. Hence, the information and discussion presented are targeted to both commercial greenhouse transplant producers and watermelon producers who are considering grafting their own plants.