Background: A field experiment to evaluate the dry matter yield and nutritive value of Sugar graze and Jumbo plus under irrigation was conducted at three different plant spacings (15 x 30, 15 x 45, 15 x 60 cm) on a red-yellow latosol in the dry zone of Sri Lanka from March to June 2016. The design was a factorial randomised complete block design with three replications. Morphological parameters measured were plant height, leaf length, leaf width, leaf area and number of leaves per plant, inter-node elongation and stem girth. Chemical composition of forages, viz. crude protein, crude fibre, neutral detergent fibre, acid detergent fibre and dry matter yield, was also determined. Results: There was no difference in the chemical composition of Sugar graze and Jumbo plus 60 days after planting. Sugar graze had significantly higher values (p < 0.05) for stem girth, leaf length, leaf width and leaf area 60 days after planting. Sugar graze produced significantly higher dry matter yield than Jumbo plus. The narrowest spacing 15 × 30 cm gave the highest yield than the other 2 spacings. Conclusions: It could be concluded that Sugar graze with 15 × 30 cm spacing will give more dry matter yield than Jumbo plus with similar chemical composition in the yala season of dry zone of Sri Lanka.