The present application provides a tree watering ring used for plant irrigation. A main body of the tree watering ring including a weed control cloth, a water-permeable cloth and a water-retaining material. The weed control cloth is located on one side of the main body, made of opaque and UV-resistant material, and has a water-injection hole equipped with a closing device. The water-permeable cloth is located on the other side of the main body, which is a double-sided permeable structure that can absorb ground moisture or release moisture into the soil. An accommodation space is formed between the water-permeable cloth and the weed control cloth, which is filled with the water-retaining material for absorbing external moisture or releasing moisture. The main body is placed around the roots of plants to adjust the soil moisture content and release the moisture from the water-retaining material when the soil moisture is low.

A tree or plant protection mat is provided, comprising: a top layer, having a first perimeter edge; a water-permeable bottom layer, having a second perimeter edge affixed either directly to the first perimeter edge, or indirectly to the first perimeter edge via an intervening sidewall; and a water-absorbing and releasing center layer disposed between the top and bottom layers, and comprising a section having superabsorbent particles and a section not having superabsorbent particles. Other mats and methods are provided.

A tree or plant protection mat is provided, comprising: a top layer, having a first perimeter edge; a water-permeable bottom layer, having a second perimeter edge affixed either directly to the first perimeter edge, or indirectly to the first perimeter edge via an intervening sidewall; and a water-absorbing and releasing center layer disposed between the top and bottom layers, and comprising a section having superabsorbent particles and a section not having superabsorbent particles. Other mats and methods are provided.