Pachira needs plenty of light but avoid direct sunlight during high summer because its leaves may get sunburned. A light sandy soil is best to give good drainage sitting on pebbles. Water 2-3 times a month. Do not let the pot sit on water and always empty excess water from the pot tray. Mist leaves once a week. Do you think you have over water it as it sounds like it, try changing the compost and reduce the watering. Also dont water for at least a week after you change the compost.

Thank you for your reply. How do I know if it is still alive? There are some white things growing around the swollen bark that have cracks on it. I have kids and dog in my apartment and I dont wish to use any harmful chemical on the pachira. Is there any natural homemade remedies that I can use? It looks very bare now as the yellow leaves are dropping and no new leaves growing. Should I move it further indoor from the south window? Please help because it looks very sad now.

Can you put a pic of it and the white growth so we can help more?

When I tried to repot the pachira today, I realized that the roots are all brown (only a few of them left) and the bottom is mushy soft, the bark is so soft that it break when I tried to touch it. Is there any hope for survival? It is now sitting on new soil in my balcony. I am unable to take the picture of the white growth because there are now gone when I repot the pachira in the new soil.