The Calanthe Sedenii Harrisii orchid is a secondary hybrid, originating from the cross between the botanical species Calanthe Vestita and the primary hybrid Calanthe Veitchii - itself derived from crossing the botanical species Calanthe Vestita and Calanthe Rosea. The formula of this hybrid is as follows: Calanthe Rosea 25%, Calanthe Vestita 75%.
The Calanthe genus was first described by Robert Brown (a Scottish botanist and paleobotanist, December 21, 1773 – June 10, 1858, who led research that resulted in the discovery of numerous plant species and genera in Australia) in 1821, publishing his manuscript in the Botanical Register (also known as "Edward's Botanical Register", an illustrated horticultural journal published between 1815 and 1847).
Beyond the aesthetic value of the taxa in this genus, its fame also comes from the fact that J. Dominyi, an orchid breeder, obtained the first artificial orchid hybrid by crossing botanical species of Calanthe, producing the taxon Calanthe Dominyi (C. masuca X C. furcata).
The distribution of the genus is associated with the southern hemisphere, with species present in all tropical zones, concentrated mainly in Southeast Asia. Known taxa also have subtropical or tropical distribution, found in China, India, Australia, Mexico, Central America, the West Indies, and various islands of the Pacific and Indian Oceans.
Within the Calanthe genus, which includes nearly 220 species and horticultural taxa, there are two subgenera: Eucalanthe (the “true” Calanthe (gr. Eu= true, kallos= beautiful, anthos= flower), characterized by retaining leaves throughout their life, including tropical and cold-climate terrestrial species - with a basal rosette from which the inflorescences emerge - and lacking pseudobulbs; and Preptanthe, which includes Calanthe species with deciduous leaves during the dormant period, represented by the cold season, possessing pseudobulbs that store nutrients and showing a constriction about one-third from their tip, with flower stems emerging from the base of the leafless pseudobulbs.
The two subgenera of Calanthe cannot reproduce to form hybrids, which likely indicates that they may be distinct genera.
Due to the complex origin of this taxon (grex), obtained through successive hybridizations of two botanical species, the phenotypic characteristics and cultivation parameters for Calanthe Sedenii “Harissii” are represented by the common elements held by the parental species.
Thus, for this special and unique terrestrial orchid, the presence of large pseudobulbs (7 - 10 cm at adult size) is notable; they are voluminous, relatively conical, with characteristic longitudinal edges and grooves, covered by a membrane and showing a transverse constriction about one-third from their tip. The large, corrugated or ridged, erect leaves with prominent veins and relatively delicate texture compared to other orchids emerge from the top of the pseudobulbs, where they attach via a narrowed petiole-like structure. The floral stems, erect, straight or sometimes curved, arise at the base of the pseudobulbs, bearing inflorescences composed of multiple individual flowers grouped toward the stem tips, white in color, with narrow sepals and petals of relatively similar size, and a visibly lobed labellum with 3 or 4 lobes extending outward. The presence of a basal spur and a labellum fused with the column is almost always noted.
Flowering is slow, occurring in the cold season, after leaf drop, between November and March. In this group of easy-growing orchids, the inflorescences persist for a long time, lasting easily a month or two after the floral stems begin, an effect that brings satisfaction to growers and is known among enthusiasts as "Christmas Orchids", due to the period when they reach peak flowering.
From a cultivation perspective, the typical growing method for the genus Cattleya can be applied to Calanthe Sedenii Harrisii, with strong to moderate light (25000 - 35000 lux), constant strong ventilation, and temperatures of 18 ℃ at night and up to 26 ℃ during the day, to benefit from a vigorous growth regime.
Being a taxon with seasonal growth, similar to the genera Cycnoches and Catasetum, it is recommended to optimize the growth process during the appropriate period to obtain pseudobulbs as large as possible during the summer by frequent watering and fertilizing. After the pseudobulbs mature, watering should be gradually reduced until the leaves fall, at which point watering should be completely stopped.
Large, broad leaves are frequently attacked by mites, spiders, woolly aphids, and aphids, making periodic intervention necessary through the application of insecticides and acaricides.
Growing environment: pseudobulbs should be separated individually after flowering and before the appearance of new growths in spring. It should be noted that pseudobulbs older than 2 years will wither and rot, which is part of the natural cycle of the Preptanthe subgenus representatives. The roots of the pseudobulbs will also die during the cold season, in the dormancy period.
The substrate used must be able to retain moisture while also quickly and efficiently draining excess water. Specific mixes for terrestrial-growing orchid groups are recommended. These can contain fir or pine bark, sphagnum moss, peat, as well as organic matter or garden soil. Calanthe sedenii “Harissii” is also well suited for hydroponic cultivation.
Recommended growing containers should have at least a 30 cm diameter to facilitate the development of new growths.
Leafless and rootless pseudobulbs can be overwintered in cool pantries, cellars, or basements after flowering ends.
Watering plants before new pseudobulbs produce their own roots is not recommended, as root formation may be delayed. Pseudobulbs are extremely fragile and can split into two pieces when repotting. The upper parts of pseudobulbs can be used to obtain new growth if dried overnight and then mounted horizontally over a layer of sphagnum moss or another similar growing medium.
Humidity recommended for this taxon ranges between 40% and 80%, depending on the growth season.
Fertilizations should be applied twice a week during the growth period and stopped during the resting season after leaf drop.
Under exceptional climatic conditions, when humidity and temperature remain constant, continuous growth without a resting season can be observed, sometimes without flowering, with flowering closely linked to the presence of a dry season, as in the case of Catasetums. In this case, if leaf drop initiation does not occur naturally, it is recommended to intervene by reducing and stopping watering, a practice also applicable to species of the Dendrobium genus from monsoon climates.
From a taxonomic classification perspective, Calanthe Sedenii Harrisii belongs to the Orchidaceae family, Epidendroideae subfamily, Collabieae tribe, Bletiinae subtribe, Calanthe genus, Preptanthe subgenus.
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