What do I do once my first 3 plants are maxed out?

I can’t seem to make progress in the game because I can’t water my plants anymore. I’m told I have to discover more plants to unlock things but I don’t know how to do that.

@Luke_Brekhus You can put it into the nursery to unlock stage 3 plants You might need essences when you doing the lab task and when you evolve. Someone will also help you with your nursery if you add some friends.

I figured it out, I just have to scroll across to make new plants.