Cordyline fruticosa is an evergreen flowering plant in the family Asparagaceae. It is known by a wide variety of common names, including ti plant, palm lily, and cabbage palm.

The plant has been cultivated in Asia and Oceania, with a number of uses including food and traditional medicine. It is of great cultural importance to the traditional inhabitants of the Pacific Islands and Maritime Southeast Asia.

It is a palm-like plant growing up to 4.5 metres (15 feet) tall with an attractive fan-like and spirally arranged cluster of broadly elongated leaves at the tip of the slender trunk. The leaves range from red to green and variegated forms. It is a woody plant with leaves 30–60 centimetres (12–24 inches) (rarely 75 cm or 30 in) long and 5–10 cm (2–4 in) wide at the top of a woody stem. It produces 40–60 cm (16–24 in) long panicles of small scented yellowish to red flowers that mature into red berries.

Cordyline fruticosa was formerly listed as part of the families Agavaceae and Laxmanniaceae (now both subfamilies of the Asparagaceae in the APG III system).

The reconstructed Proto-Malayo-Polynesian word for ti plant is *siRi. Cognates include Malagasy síly; Palauan sis; Ere and Kuruti siy; Araki jihi; Arosi diri; Chuukese tii-n; Wuvulu si or ti; Tongan sī; Samoan, Tahitian, and Māori tī; and Hawaiian kī. The names in some languages have also been applied to the botanically unrelated garden crotons (Codiaeum variegatum), which similarly have red or yellow leaves. The cognates of Proto-Western-Malayo-Polynesian *sabaqaŋ, similarly, have been applied to both garden crotons and ti plants.

In the Philippines, they are also known by names derived from the Proto-Austronesian *kilala, "to know", due to its use in divination rituals. Cognates derived from that usage include Tagalog sagilala; and Visayan and Bikol kilála or kilaa, though in Central Visayas, this plant is called ti-as. In New Zealand, the terms for ti were also transferred to the native and closely related cabbage tree (Cordyline australis), as tī kōuka.

Its original native distribution is unknown, but it is believed to be native to the region from Bangladesh, to Mainland Southeast Asia, South China, Taiwan, Maritime Southeast Asia, New Guinea, and Northern Australia. It has the highest morphological diversity in New Guinea and is believed to have been extensively cultivated there.

It was carried throughout Oceania by Austronesians, reaching as far as Hawaii, New Zealand (including the Kermadec Islands), and Easter Island at their furthest extent. A particularly important type of ti in eastern Polynesia is a large green-leafed cultivar grown for their enlarged edible rhizomes. Unlike the ti populations in Southeast Asia and Near Oceania, this cultivar is almost entirely sterile in the further islands of eastern Polynesia. It can be propagated only by cuttings from the stalks or the rhizomes. It is speculated that this was the result of deliberate artificial selection, probably because they produce larger and less fibrous rhizomes more suitable for use as food.