Tree bathing is discussed here
From the media
"Tree bath in the article about irrigation systems for healthy trees in summer on wohnglueck.de"
"Measures against climate change - baumbad watering bags save trees in the Hockenheim city area."
nordbayern.de "The irrigation bags help to bring the water to the roots in an even more targeted manner."
"The tree continuously receives small amounts of water via the water tank on the tree"
"Dig a hole, put the tree in place, done. In earlier decades, municipal employees gave little thought to the planting of trees."