Cordyline, or ti, are common decorative plants that thrive outdoors in hardiness zones 9-12 but also make excellent houseplants. The name Cordyline originates from Greek; the word kordyle, meaning "club," is a reference to the plant's enlarged underground stems. Cordyline typically has leathery leaves shaped like a spear or lance with a variety of colors, including green, red, yellow, white, purple, and purplish-red. Caring for these plants indoors is simple and straightforward, but they must be kept warm, and they need a lot of light.
Cordyline is sensitive to fluoride, which is found in many a homeowner's water supply. If the tips of the leaves of your ti plant are brown, this might be the culprit. Switching to bottled water might be the answer.
Ti needs bright light, but avoid direct sunlight in unhabituated plants. Also, green-leaved cordyline tends to do best with direct light, while those with other colored leaves may prefer bright indirect or filtered sunlight.
It is important to keep the soil your ti is planted in continuously moist. Reduce watering during the winter and water your plant whenever the soil surface starts to feel dry.