They say it's better to water intensively but rarely, and eventually the plant has to manage on its own. Therefore, so far we have regularly watered all shrubs and trees (in total, if I count the 20 m beech hedge from autumn, certainly over a hundred plants, some bare-rooted, some in containers, some balled) intensively in the first period after planting. Otherwise, not at all. So it should also do well without an irrigation system.