Water restrictions and shortages affect the long-term viability of urban trees, which take decades to reach maturity and to provide benefits to our environments. How much water do trees need to survive/thrive? It may be surprisingly much less than most water prescriptions because the water evaporates and runs off is not accounted. We will look at case studies of saving 90+% water usage during droughts and water restrictions. The main goal is to provide methods to keep trees alive and thrive during water restrictions and shortages without breaking water restriction rules or paying fines. It also enhances water conservation.