Failing to adjust fertilization may worsen the impact of water stress. A Moroccan olive study reveals that reasonable reductions in NPK supply under deficit irrigation can sustain high yield levels, fruit physical quality, and olive oil composition. The oil produced under these conditions was richer in health-promoting compounds thus boosting long-term value. The key for growers facing climate change is finding a sustainable balance that enhances tree resilience without severely compromising yield and oil quality.