Refers to the act of giving water to plants, typically in gardening or farming contexts.
Please don't forget to water the plants in the morning.
この花は水やりが少なくても育つ。
This flower grows even with little watering.
Standard spelling; uses kana for the verb part to avoid the less common kanji 遣.
Kanji spelling using 遣; less common but still seen.
Compound of 水 (water) and the noun form of やる (to give, to do), literally 'water-giving'.