What is the best plant to put in your bettas tank?

Question:I have seen lots of bettas with pretty fowers and plants in their tank.Well i just want to know what flower/plants can you put in the tank.AS long as the plant is exspensive and huge list the plants i can put in its tank



ALSO i have this plant at home called a opical its a purpleish pink and green plant.I just wanted to know if i wash all the dirt of could it survive in the water without killing my crown tailed betta.

Answers:
The only thing I've seen are surprise lillies, and they're really inexpensive.