Oncidium Leaf Tip Browning: Salt Buildup, Fertilizer, and Light Fixes

Oncidium leaf tips brown ("rust") from salt buildup (hard water or softener) or over-fertilizing. Flush monthly: water, wait 2–3 hours, water again. Feed at ¼–½ strength. Light green leaves = correct light; dark green = too shady.

Solutions

• Monthly double-watering flushes salts.
• Reduce fertilizer to ¼–½ label strength.
• Increase light gradually for light green leaves.
• Air movement; 50%+ humidity.

Cymbidium Bonus Advice

• More sun than Oncidium; light–medium green leaves.
• Outdoors as much as possible; 40–85°F tolerant.
• Barely moist between waterings; same weak feeding.

Key Takeaways

• Tip burn = salts or fertilizer; flush and dilute.
• Oncidiums want bright light (light green leaves).
• Cymbidiums want even more light and outdoor life.

Flush salts, dilute feed, brighten light—oncidium tips recover; cymbidiums need more of everything.