Some mods target the Mono version of the game, which is available by opting into the Steam beta branch "alternate"

AutoWater
Automatically waters pots that are under 30%. Scans every 60 seconds.
CHANGELOG
0.1.0
- Initial Release
0.2.0
- Changed default value from 10 seconds to 60 seconds
0.3.0
- Only water if the pot has a plant