Three different studies investigated optimal irrigation and fertilizer strategies to enhance water and nutrient use efficiency in ornamental crop production. For experiment 1, geranium and petunia plants were subjected to various irrigation methods (manual, tensiometer, and timer-based controller) and fertilizer rates (7 and 10 g controlled-release fertilizer) in a greenhouse. Petunia plants showed no significant interaction or main effects, while the -15 cb tensiometer setting for SPAD values and timer-based controller for root dry weight for geranium was significant. Water use efficiency (WUE) was not significant for either crop. In experiment 2, irrigation and fertilizer effects were again evaluated on poinsettia and chrysanthemum plants. For poinsettia, SPAD reading were greatest with -20 cb tensiometer irrigation and 10 g fertilizer, while all other parameters were greatest for the manual but not different than the timer-based controller. Chrysanthemum height, number of flowers, shoot and root dry weight were greatest with timer-based controller irrigation and 10 g fertilizer. There was an irrigation effect but the -15 and -20 tensiometers demonstrated the greatest WUE for poinsettia. In experiment 3, geranium growth and flowering was evaluated under different timer-based irrigation and fertilizer (3, 6, and 9 g) schedules. Watering 1 minute in the mornings with 6 g of fertilizer led to increased plant height, shoot dry weight, flower production, and WUE. Timer-based controlled irrigation methods showed promise in optimizing water and nutrient utilization, suggesting their role in reducing labor costs while maintaining crop quality. Optimum fertilizer rates varied from 6 or 10 g depending on the species.