December

The December Flower, botanically classified under the genus Barleria within the family Acanthaceae (the acanthus family), is a highly attractive, fast-growing evergreen tropical shrub. Native to the sunny forest edges, dry riverbanks, and open scrublands of tropical Asia—spanning India, Myanmar, Thailand, and the Philippines—this resilient plant has been cultivated extensively for centuries. It is celebrated worldwide for its ability to produce masses of tubular flowers during the winter months, earning its cheerful common name, the December Flower.

Growing in dense, bushy, multi-stemmed mounds to a height and spread of 2 to 4 feet, Barleria is characterized by dark green, opposite, oval-shaped leaves covered in fine hairs. While it can produce scattered blossoms throughout the year in warm climates, it experiences an explosive flowering peak from December through February. Individual flowers are tubular, measuring 1 to 2 inches long with a 5-lobed corolla in shades of violet-purple, lavender-blue, soft pink, yellow, or pure white, all wrapped inside distinctive, crown-like crested or spiny floral bracts.

The reproductive morphology of the December Flower is represented by the zygomorphic floral formula EBr % ⚥ K(5) C(5) A4 G(2). This formula states that the flowers are ebracteate in structural classification (though enclosed in prominent leaf-like bracts), bilaterally symmetrical (zygomorphic), and bisexual. The calyx is composed of 5 fused sepals, and the corolla features 5 fused petals forming a two-lipped tube with a 4-lobed upper lip and a single-lobed lower lip. The androecium contains 4 fertile stamens in two pairs of unequal lengths (didynamous), surrounding a superior ovary of 2 fused carpels.

Horticulturally, Barleria is an exceptionally tough, low-maintenance, and easy-to-grow plant. It thrives in full, direct sun to light, partial shade, requiring at least 4 to 6 hours of daily sunlight to bloom profusely. It is highly adaptable to a wide variety of soils, from fertile loam to dry, poor, sandy, or gravelly soils, provided they are exceptionally well-drained. It is highly drought-tolerant once established but benefits from regular watering to maintain rich foliage. It is frost-tender and grows as an evergreen perennial in tropical USDA zones 9 through 11.

The genus is named in honor of the prominent 17th-century French botanist Jacques Barrelier, while the specific epithet *cristata* references the beautifully crested, crown-like floral bracts surrounding the blossoms. Famed in Sanskrit as Kurantaka (कुरंटक) or Vajradanti (वज्रदंती, meaning 'diamond teeth' due to its ancient use in traditional oral health) and in Hindi as Nil Jhinti (नील झिण्टी), it carries immense cultural value in Asia. In southern India, the winter-blooming flowers are sacred, woven into garlands for temple offerings and worn in women's hair.

For pet owners and veterinarians, the December Flower is a highly safe, premium, and functional choice. *Barleria cristata* is classified as completely NON-TOXIC to cats, dogs, and horses by major global animal safety databases. If a pet plays with or nibbles on the green foliage or waxy tubular blooms, there is absolutely no risk of toxic poisoning. To discover more pet-safe evergreen shrubs and beautiful tropical additions, visit our general Pet Guard catalog. Additionally, in traditional Ayurveda, the leaves and roots are crushed to make soothing pastes for dental pain, coughs, and skin inflammation.

December Barleria is occasionally confused with true violets or bluebells. It is easily distinguished because Barleria is a woody, multi-stemmed shrub rather than a small herbaceous groundcover, and features distinct crested or spiny floral bracts. It is an outstanding choice for hedges, borders, and tropical container gardens; we recommend pairing it with other sun-loving, non-toxic classics like the golden Marigold or trailing Wild Pansy. To explore more tropical landscaping combinations and winter-blooming shrubs, browse our Flower Identifier.