Water thoroughly when the potting medium is nearly dry. Avoid letting the plant sit in standing water, as this can lead to root rot. Reduce watering slightly during cooler, dormant periods.

Ensure good drainage to prevent waterlogged roots.

Remove spent flower spikes at the base once blooming is complete. Cut away any yellowing, brown, or dead leaves or pseudobulbs. This helps the plant conserve energy and promotes healthy new growth.

Sterilize your cutting tools to prevent disease transmission.

Oncidium ornithorhynchum is typically propagated by division. When the plant becomes overcrowded, carefully divide the pseudobulbs, ensuring each division has at least three healthy pseudobulbs and some roots.

Replant the divisions immediately in fresh orchid mix.

Repot every one to two years or when the potting medium begins to break down. Use a well-draining orchid mix, such as bark-based media. Repot after flowering, or in spring, to avoid disturbing new root growth.

Ensure the pot has adequate drainage holes.