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20-Year Outdoor Orchids Declining: Need ID for Specific Advice

Without knowing the genus, I can't prescribe. Cymbidiums? Dendrobiums? Epidendrums? Each has totally different needs.

Critical Questions

What type of orchid? (Pseudobulbs? Canes? Strap leaves?)
Your region/climate zone?
Pots or ground? Year-round outdoors?
Is this yellowing new behavior or seasonal?

General Notes

Dividing large plants often delays blooming 2+ years. Cold damage causes leaf loss. Repot in appropriate mix for the genus. Fertilize during active growth only.

Orchids: Mystery Orchid Bulbs in NorCal: Likely Cymbidiums, Find Local Help; Small, Deformed Phalaenopsis Flowers? Light Is the Key; Phalaenopsis Near Death: 2 Leaves, 2 Roots, Stringy Root Remnants—Can It Be Saved?; First Phalaenopsis in Florida: Bud Drop from Fruit Bowl, Fixed by Moving; Orchid Repotting 101: Step-by-Step for Beginners; Jasmine and Tabernaemontana Problems: Pot Size, Spider Mites, and Scale; Identifying Mystery Dollar Store Plants: Spider Plant Relative and Fern; Identifying Inherited Houseplants: Hoya, Zygocactus, Rex Begonia; Pepper Plants Declining After Transplant: Upside‑Down Leaves & Dark Spots; Spring Garden Prep: From Seedlings to Raised Beds

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