Simplify the following text for a Grade 5 native English-speaking person.
Original: The bonsai pot is almost always placed on a formal stand , of a size and design selected to complement the bonsai and its pot .
Simplified: Every two or three years , the bonsai owner lifts the bonsai out of its pot and trims the roots . Then the owner puts the bonsai back in its pot with some new soil .