Place the Ficus triangularis tree in bright light, such as beside a sunny, south-facing window or on a patiothat receives full morning sunlight but is protected from the harsh afternoon sun.
Keep the ficus tree in warm temperatures, preferably between 60 and 75 degrees Fahrenheit. Water the Ficus triangularis deeply once every one or two weeks, only when the top 2 inches of soil dries out.
Feed the Ficus triangularis tree a liquid houseplant fertilizer once or twice each month during the growing season, following the instructions on the label. You can also use a liquid tree fertilizer diluted at half the normal dosage.
Re-pot the Ficus triangularis once every year in the late winter or early spring, when the roots have filled the planter pot. Re-pot the tree in a container that is about 2 inches wider and deeper.