A Colmanara Wildcat "Yellow Butterfly" (Oncidium alliance) hasn't bloomed in two years. It's in a south-facing bathroom, watered weekly, never repotted. The potting mix has decomposed to mush. The owner fears harming this sentimental plant.
Decomposed mix retains too much water and restricts airflow, causing root rot. Repot at the first sign of new growth. Use a mix with tree fern for Miltonia/Odontoglossum/Oncidium types (e.g., Roberts Flower Supply). Soak the plant and new mix before repotting. Remove all mushy roots.
Move outdoors after frost danger passes. Use 50–60% shade cloth on a deck or porch. Mist on hot days. Provide good air movement. The intergeneric name is Colmanara (Miltonia × Odontoglossum × Oncidium).
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