To ensure proper watering the first year after planting, that is, the year in which plants are settling in and will need more water than when they are fully established, why not form a watering basin around each new plant?
This technique is used mainly with trees, shrubs and conifers because they tend to be slower to establish than herbaceous plants and also because they are usually a good size at planting and therefore require a greater quantity of water each time you irrigate. However, it can also be applied to any plant, especially if it’s in a situation where it is likely to need frequent watering.
A water-holding basin is simply made of a berm of soil up to 15 cm high all around the root ball. When you water, simply fill the basin with water. The water will then percolate into the soil exactly where the plant needs it!
When the plant is well established, usually after a year, just remove the basin and then the plant will benefit from the same watering as neighboring plants. In a situation where the plant is likely to continue to suffer from a lack of water and therefore will need regular watering (plantings under a roof overhang, in sandy soil, under trees with abundant roots, arid climate, etc.), however, you can leave the basin in place permanently.