This study undertook a comparative assessment of the effectiveness of various extension communication / teaching methods for the adoption of horticultural innovations by farmers. Fourteen Village Extension Agents (YEAs) and 98 fruit and vegetable farmers were randomly selected from Ikorodu area of Lagos State, Nigeria. A structured questionnaire and an interview schedule were the research instruments used for the data collection. Chi-square analysis was used to test the hypotheses of the study. The results reveal that farm visit, home visit, result demonstration, group meeting, agricultural show and exhibition, method demonstration, farm tour, field day, field trip/excursion, village instructional board and posters are the most appropriate and effective methods. Specifically positive and significant relationship exists between extension communication/teaching methods and (i) adoption of innovations and (ii) gender of farmers in relation to adoption. Significant difference also exists between the effectiveness of the various methods in relation to adoption level. Based on our findings, it is confirmed that the adoption levels depend on methods' effectiveness and some socio-economic characteristics of the farmers and the agents. Hence, prevailing circumstances of the farmers should be taken into consideration in the choice of communication methods and their combination, for increased effectiveness and adoption.