is a herbaceous and commonly cultivated house plant of the genus Kalanchoe native to Madagascar. It is known by the English common names flaming Katy, Christmas kalanchoe, florist kalanchoe and Madagascar widow's-thrill.
Kalanchoe blossfeldiana is a glabrous, bushy, evergreen and perennial succulent plant which (in 2–5 years) can reach an ultimate height of between 30–45 cm (12-18 in.) and an ultimate spread of between 10–50 cm (4-20 in.). K. blossfeldiana has a round habit and a moderate plant density; its growth rate has been described as 'slow' The plant has green, shiny and textured glossy foliage which stays green all year round. The scallop-edged and ovate leaves are arranged in an opposite/subopposite fashion, are simple in type with crenate margins and an oblong shape. The arrangement of the veins in a leaf (venation) can be absent or very hard to see; the leaf blades are 5–10 cm. (2-4 in.) long K. blossfeldiana flowers in late autumn to early winter; each flower has four petals and can be one of a wide variety of colours, from the dark reds and pinks to oranges, golds and whites. The ovary is tetracarpellary and apocarpous while stamens are four in number and are epipetalous. The inflorescences are born by peduncles which are higher up than the leaves and are terminal in nature. Parts of Kalanchoe blossfeldiana are poisonous if ingested.
Kalanchoe blossfeldiana is native to Madagascar, where the plant can be found growing in the relatively cool plateaus of the Tsarantanana Mountains; K. blossfeldiana in this environment grows in humus soil.