Their large leaves tend to collect dust and should be gently wiped off occasionally. Leafshine products can be used. Vining types are propagated by setting tip cuttings. Arborescent types are usually divided when they develop several growing points. Brown tips usually indicate the plant is being kept too dry.
Yellow leaves indicate too much water.
Be especially careful in winter not to overwater. When it is too hot or too dry, leaves shrivel and brown. It usually indicates that the plant is not getting enough fertilizer. If you are feeding according to directions, check the soil pH. It may be too high or low and keeping the plant from utilizing the fertilizer. This is usually caused by sunburn.