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

Overwatering is a common mistake, so err on the side of slightly underwatering if unsure.

Remove spent flower spikes at the base once blooming has finished. Cut away any yellowed, dead, or damaged leaves or pseudobulbs using clean pruning shears.

This helps maintain the plant's health and directs energy towards new growth and future blooms.

Oncidium sphacelatum is typically propagated by division. When the plant becomes overcrowded in its pot, typically when it has at least three to four pseudobulbs, carefully divide the rhizome with a sharp, sterilized knife, ensuring each division has healthy roots and pseudobulbs.

Repot every 1-2 years after flowering, or when the potting medium begins to break down. Use a well-draining orchid mix, such as bark chips or sphagnum moss.

Choose a pot that is only slightly larger than the previous one to avoid excessive moisture retention.