GM-2 is a superior tomato accession originating from Indonesia and exhibiting nematode resistance. A problem with GM-2 tomatoes is poor seed quality. Improvements to fruit and seed quality are needed through boron fertilisation and seed priming with Trisodium Phosphate (TSP). The objectives were to evaluate the effect of boron fertilisation on fruit quality and to assess the combined effect of boron fertilisation and TSP priming on seed quality and seedling growth in GM-2 tomato. The study on boron fertilisation was carried out in Ngablak District, Magelang Regency, Indonesia, from October to December 2023, using a CRD with three replications. Boron fertilisation consisted of 0 and 1.25 g.plant-1. The study on TSP priming was conducted at the Faculty of Agriculture, Universitas Gadjah Mada, from December 2023 to January 2024, using an RCBD factorial with three blocks as replications. TSP concentrations ranged from 0, 5, 10, and 15 g.L-1. The results showed that boron fertilisation significantly increased fruit number and fruit fresh weight by 9.38% and 14.34%, respectively, and improved fruit firmness (5.64%) and seed moisture content (1.02%). TSP concentration significantly influenced seedling growth. The TSP concentration of 15 g.L-1 increased root surface area by 427.27%, root fresh weight by 159.04%, shoot fresh weight by 115.22%, root dry weight by 23.08%, and shoot dry weight by 55.56% compared to without seed priming.  Overall, this study provides practical recommendations: boron fertilisation can improve fruit quality, while TSP priming can improve seedling growth of GM-2 tomato.