Conserving water and reducing the environmental impact of runoff are two important issues confronting container nursery operations. Current regulations in five states limit water consumption and/or nutrient concentrations in runoff. Researchers investigated whether irrigation scheduling based on daily water use (DWU) — the combined loss of water from plant transpiration and substrate evaporation — could conserve water. According to the study, “scheduling irrigation according to plant DWU substantially reduced the amount of irrigation applied.