I have a Madagascar jewel that is very happy but quite top heavy. I have tried bracing with gardening sticks and other things, and at one point it had leaned onto the power cord for the lights that were above it. It's been leaned temporarily up against the glass sliding door to our sun room, but I don't like it there as the leaves are starting to curl and discolor. I want to transplant it to a bigger pot with more dirt, but I was wondering how far up the trunk I can safely put the soil to help it stand on its own