I have a few suggestions to upgrade this game, I really like it but, I think it would be cool if you added more plants and more rooms. Justice suggestion you do not have to listen to me.
When you get a new plant, you study it on the plant nursery and if it has a special trait, it will get a star by its name (Depending on how many traits, there will be more stars). When you have the stars, you can choose a special plant pot for that plant only rather than the normal five. I got the picture attached to show you a two-star plant as well.