Finding a reliable water pump that can work at the same voltage than Arduino not only is possible it is probably the best option for building automatic plant watering projects.
Using the same 5V voltage that powers the Arduino will simplify dramatically the electric design of your automatic watering system. So, if the sizing of your project allows it, use low voltage water pumps.
The main advantages of this water pumps its their operating current, because it is so low they can be powered directly by the Arduino 5V outputs, making a very simple set-up that will make it easier and faster for prototyping of your automated watering system.
There are many 5V water pumps available on the market, from the cheaper to more expensive, but there are basically two options of 5V water pumps:
This pumps are cheap and useful for prototyping but they wont last very long under intensive work load, so they are good for prototyping and projects that require watering from time to time and not a continuous water flow. If you plan to have a continuous water flow, go for a better one.
Price: 1.5$ View on Aliexpress
The difference between this type of pumps and the ones seen above is the expected working life, this models can last quite a long time, and they can run continuously without getting burned, so this is a good choose for an hydroponic watering system made with Arduino.
Price: 4.5-9$ View on Aliexpress
If this 5V Arduino water pumps do not fit your needs, you can take a look on this alternative solutions:
All this options are explained on the following post:
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