Oncidium sphacelatum aka Dancing Lady

Oncidium sphacelatum is known as the popcorn orchid. It belongs to the orchid family, Orchidaceae. This tropical perennial grows in Mexico, Central America, and southeastern Venezuela. Its native range has a wet tropical climate. It grows on trees, though some plants grow on rocks. The species name refers to its brown spots. It is among the larger orchids in its genus.

Plants reach 1–6 feet (0.3–1.83 metres) tall. They spread 1–3 feet (0.3–0.91 metres) wide. Their dense growth has an arching, spreading form. Large pseudobulbs store water and bear two or three leaves. The leaves are green, long, and strap-shaped. They have smooth edges and no hairs. Each leaf exceeds 0.5 feet (0.15 metres) in length. Growth proceeds at a medium rate. A mature plant can outgrow a windowsill.

Flowers appear in spring on stems from the pseudobulbs. The branching sprays arch under many small blooms. A spray can carry 50 to 100 flowers. Flower sprays usually reach about 3 feet (0.91 metres). The longest can reach 6 feet (1.83 metres). Each flower measures about 0.08 feet (0.025 metres) across. The blooms are yellow with brown patches and a light scent. They attract bees. The fruit is a capsule.

Give this orchid bright light without direct sun. An east- or south-facing window can provide suitable light. Too little light leads to poor flowering. Use coarse or medium bark-based orchid mix. The roots need both air and good drainage. Keep humidity above 60 percent, with good air flow. Water well during active growth, then let the mix dry. Conditions may allow a week or more between waterings. Reduce watering during winter when growth stops. Dormant plants can withstand drought. Feed during growth with orchid fertilizer at the label rate.

This orchid suits containers and greenhouse growing. Its flowers make it a useful specimen plant. It can spend summer outdoors. The listed USDA hardiness range is 10b–12b. Divide plants in spring to make new ones. Its care needs are moderate, and pest problems are few. Mealybugs and spider mites can still occur. ASPCA lists it as non-toxic to cats, dogs, and horses. That safety listing does not establish whether people can eat it.