Oncidium Mendenhall Struggling in Seattle: Light, Mix, and Cycle

Warm-Growing Oncidium Needs Light and Open Mix

Oncidium Mendenhall (Carter & Holmes hybrid) wants heat and bright light—Seattle’s cool, cloudy climate is challenging. Don’t mix moss into bark; it accelerates breakdown. Use medium fir bark (½”), sifted, soaked. Repot when new growth emerges at pseudobulb bases. Keep above 55°F outdoors in semi-shade. Pseudobulbs shrink slightly during rest—normal.