4.Put a few inches of potting soil in the bottom of the new larger pot (no more than about 1 inch larger in diameter than the old pot), put the plant into the pot, and make sure the soil level is high enough so that the soil line on the plant stem isn't above the top of the pot. The soil line should be about 1" below the top of the pot. If it's too low, add more soil below the root ball.