The Malabar chestnut (Pachira aquatica), also known as the money tree plant, is considered to be a symbol of good luck and prosperity. The money tree plant prefers indirect light and will tolerate low light conditions. If the plant begins to yellow or wither, it needs more light. Water every seven to 10 days or when the top 3 or 4 inches of the soil are dry, keeping the deeper soil moist, but not wet. Trees may need more water in hot environments or when the indoor air is dry.