Presence of water affects not only growth and health, but the life itself. Incorrect watering can cause a plant to wither in extreme cases. When to water? In the morning, when it's not hot, or in the evening before sunset. Never water in heat. Intense sun can cause burns in plants, and great part of water is lost due to evaporation.
The most important rules for watering a garden
Watering is the most important task when caring for plants.
How to water?
Abundantly, but rarely. Frequent watering with small amounts of water is not beneficial to plants. Such watering does not allow water to penetrate deeper into ground. Therefore, plants create very shallow and weak rooting. Moreover, surface layers of soil can dry much faster, making the plants very sensitive to periodic droughts (e.g. when you leave for a long time). Water soaking to deeper ground layers stimulate roots to grow deeper as well. With that, plants hold to ground very well and absorb water from deeper water sources.
What to use for watering?
As for the watering "technique" itself, beware of too strong water jet and leaf soaking. Most plants do not like being "watering their heads". So let's direct the stream under the plant, around its base. In addition, a strong stream of water can lead to damage (tearing) of plant tissue. And this is half the way to entering the disease state (the weakened plant is more likely to be attacked by pests, in addition, the torn tissue is a gate for pathogens e.g. fungal diseases). Plants with decorative foliage and flowers require special care. Here, it's best to use a watering can or the appropriate spraying mode on the watering gun. It will probably take a little more time, but you will be able to make sure that the decorations of your gardens are repaid with a beautiful appearance and great condition.
Remember to choose the right length of garden hose for your needs!
Alternative solution exists for those, who don't have time or will for such maintenance – Automated watering system. With drip irrigation line, it transfers water precisely to root clumps. Large areas (e.g. lawns, meadows) can be watered with sprinklers, selected based on the shape and area of watered surface. The system operates thanks to a controller. It can offer the simplest or very complex settings, depending on the price. Think well, which features will be most useful for you. Maybe you don't need a full-fledged "computer" that links to a satellite meteo station, and the most basic feature of watering timer (set up manually or automatically) will suffice? ;)