Oncidium sphacelatum

The popcorn orchid is a tropical, epiphytic herbaceous perennial in the orchid family (Orchidaceae). It is native across a wide area from Mexico to northern South America. The species epithet is Latin for “having brown speckling or spotting.”

Provide a coarse to medium, bark-based orchid potting medium that allows for good aeration and drainage. They grow bright, indirect light, such as a south- or east-facing window. They need high humidity (above 60%) and good air circulation. When in active growth, the popcorn orchid should be watered thoroughly and then allowed to dry out before watering again. That means a plant may need water no more than once a week, depending on conditions. During the winter, when they are not growing, they can be watered less frequently. During dormancy, they are very tolerant of drought. Fertilize during the growing season with orchid fertilizer mixed in water according to instructions on the label.

The flowers of the popcorn orchid are small, but they are produced in profusion, on arching panicles that may be three or more feet long. The yellow and brown flowers are showy and mildly fragrant. 

This plant can grow very large, outgrowing a windowsill, but it makes an excellent greenhouse subject. It can spend its summers outdoors.

Diseases, Insect Pests, and Other Plant Problems: These orchids have few problems. They are generally not affected by pests, but watch for mealybugs or spider mites. Insufficient light results in poor flowering.