Nicknamed by its shape, the Cockle-shell is also known as the Clamshell Orchid. This orchid and a few siblings have been moved from one family to another, namely, Encyclia, Anacheilium, & Epinendrum due to some distinct characteristics. Today, it is officially named Prosthechea cochleata.
It grows differently than most orchids. The labellum or lip of the Clamshell orchid flowers grow in a way that forms a hood that covers the column. Quite the opposite of what is common to orchids where the lip grows in an outward direction from the column. And while its inflorescence stays on top, its tepals grow hanging downwards, forming what seems like of an octopus. Its looks is a gratifying feat that hides the fact that they are not as freely fragrant as they look.
Sharing features with the genus Epinendrum and Encyclia, clamshell orchids are also good beginner specimens. It favors medium lighting due to its leaves being thin. A session with the morning sun by the window is more enough to fulfill its daily needs.
It requires abundant moisture at their roots while in development. For a less humid season, misting with distilled water several times in a day or placing a tray of water under it would help keep it from becoming dry. If it's too dry, spider mites might attack the plant. With such requirements of well maintained humidity, a good circulation of air in its area of growth will help greatly in preventing fungal and bacterial growth. You can also tell a healthy orchid by checking the roots if it turns green from white when watering.
When it's in active growth, it would be the best time to put some fertilizers. For most mediums, a 20-10-20 NPK is sufficient, except for fir barks. Fir barks share nitrogen when decomposing so you need a fertilizer with higher nitrogen content. There are also fertilizers made for orchid blooming at 6-30-30 but pretty much effective for epiphytic orchids such as the Clamshell orchid.
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