Neat idea, and could be built out into a farming feature for a survival or farming game. Some simple areas to improve would be adding audio, making the buttons react to me hovering over/clicking them. And providing a bit more info about how much water a plant needs, what the finished state of the tomatoes will look like so we know when to harvest..
All in all, it's short and sweet. Great entry for a one-week jam.

Best,
-Thxrst