As with water in the home, if you save water, you are also helping to save the energy used to produce clean water. One way of doing this is to opt for plants with a low water need or that are drought resistant, especially if you have a dry, free- draining soil. Plant according to local topography, for example, put plants with a higher water requirement in dips or any area that is likely to retain the most water naturally. You should also consider the following - Harvesting rainwater and Re-using water.