I’m not a plant expert, but a couple thoughts come to mind—are you over-watering the plant? I water mine a small amount about every 10 days to two weeks. Also, does the planter you’re using have drainage? A hole or small rocks at the bottom? I hope this helps!
It can grow as big as several feet If transferred into soil but it will stay fairly smaller if it stays in a pot
I've never heard of this house plant being used for tea before.
Keep in indirect sunlight, and water around once a week, as long as it’s dry. You will know it’s dry by how light the pot feels when you lift it. We put water in a shallow dish and set the plant container bottom directly in the water. It will pull up water from the holes in the plastic container, all the way to the surface dirt.