In my head i was thinking more like difficulty ramps up after each puzzle, maybe in size, but also adds more rules. Like some flowers might need to be attached to water as well, or they might need to be isolated from other plants. I have no idea if these specific ideas would make for a more fun puzzle, (im sure you could come up with better solutions and rules to add). But atleast thats where my mind went as i was playing, that the core is fun, but it would be interesting if more complexity could build up over time.