that truvia is so expensive.

i thought if I could grow it it would be a huge saving lol
Plus, Truvia is Stevia that has been heavily processed; it bears little resemblance to the real stuff. In fact, you will find it is packaged with maltodextrin to give it bulking so you are able to use it.
The best option aside from growing it is to get the bottled variety. It is made with glycerine, and has 0 carbs. It also doesn't have a bitter aftertaste.
Thing is, for a 3 oz bottle, it is around 10$. It is way cheaper to make it on your own - but for convenience, the bottled stuff is the best.