Watering is essential to the life of a plant. Plants use water to carry not only water but nutrients from the roots to the rest of the plant. Water then transports food from the leaves down to the roots. Too little water causes roots to dry and the plant begins to die. Too much water can be just as detrimental, stressing the plant and causing disease or possibly death. There a few different ways you can choose to water plants. Some of these systems conserve water and others focus on watering the plant in a way that lessens stress.
Use sprayers hooked up to an outside faucet to water plants. Hoses can be outfitted with special sprayers available at home improvement stores that allow water to spray plants lightly.
Use a hose system attached to a rain barrel. Rain barrels store rainwater, allowing you to use the water later.
Reserve water from cooking or cleaning in a container with a spout to water smaller areas of your yard or indoor plants. A plastic gas container can be stored underneath the sink where it can be filled with leftover water. It is a good way to conserve water and plants can benefits from the water leftover from cooking.
Use a trickle or drip irrigation system for larger outdoor areas. Such systems water plants at the roots, conserving water and protecting plants from the weight of a blast of water. Irrigation systems can be installed by a professional or purchased as a kit from a home improvement center.