The study on Grafting compatibility of tomato (Solanum lycopersicum), brinjal (Solanum melongena) and chilli (Capsicum annum) through cleft graft method was carried out under the mist chamber conditions at college orchard, Department of Horticulture, Agricultural College and Research Institute, Madurai during 2019 - 2020 with the aim to identify the best grafting compatibility between the crops through cleft grafting method. 9 level of crossing among the crops viz., Tomato X Tomato, Tomato X Brinjal, Tomato X Chilli, Brinjal X Brinjal, Brinjal X Tomato, Brinjal X Chilli, Chilli X Chilli, Chilli X Brinjal and Chilli X Tomato were grafted with cleft grafting method. Tomato var. PKM-1, Chilli var.K-2 and Brinjal var.PKM-1 used for this study. These grafting of rootstocks and scions were done in polybags and kept under mist chamber for compatible graft union. The study was laid out in Randomized Block Design (CRD) with 9 treatments (crossing) and ten replications and analyzed statistically. The results revealed that the plants are compatible with the grafting through cleft grafting method viz., For Tomato x Chilli, survival rate (95.47%), days taken for graft union (10.40days), number of leaves (26.75), plant height (56.65cm), number of sprouts per grafted plant (4.80), shoot length of the plant (43.30cm), root length (52.67cm), fresh weight of roots (20.13g) and dry weight of roots (18.32g). For Brinjal x Tomato, survival rate (67.35%), days taken for graft union (11.20days), number of leaves (25.25), plant height (53.42cm), number of sprouts per grafted plant (2.35), shoot length of the plant (41.50cm), root length (49.87cm), fresh weight of roots (20.12g) and dry weight of roots (18.50g). For Chilli x Tomato, survival rate (77.35%), days taken for graft union (10.60days), number of leaves (24.35), plant height (55.87cm), number of sprouts per grafted plant (4.30), shoot length of the plant (43.90cm), root length (52.10cm), fresh weight of roots (19.89g) and dry weight of roots (17.40g) and this is the best method of grafting in tomato, brinjal and chilli for graft compatibility
