This chapter reviews nutrient management in different production systems for ornamentals. Proper nutrition in containerized and field grown plants is essential for maximized growth and profitability. Macro- and micro-nutrients along with substrate or soil amendments ensure that plants remain healthy and continue to grow optimally in both mineral soils and soilless substrates. Nutrient management coupled with precise irrigation are key factors in growing healthy high-quality plants for the ornamental plant industry. The following topics are discussed in this chapter: Irrigation and water quality concerns for growers; the different types of fertilizer and when they should be used; the impact of soils and substrates on fertilizers; and the impact of production systems on fertilizer longevity.