Oncidium New Growth: Identifying a Developing Pseudobulb

Strange Oncidium Shoot: New Growth or Keiki?

Chris's Oncidium produced a leafy shoot from the base of the largest bulb, same side as the flower spike. It's lighter green, slightly sticky, leaves tightly wrapped. Now 4 inches tall, leaves loosening at tip. He asks what this shoot is.

Expert Response

Chris, Oncidiums often leak sticky sap as they grow. Thin leaves and sap attract mites and mealybugs. Sap leakage is normal but guard against pests. Check inside rolled leaves and sheaths for white fuzzy mealybugs; spray with systemic fungicide at first sign. Mites cause web-like structures and lighter leaf damage; need specific miticide. Mites thrive in dry conditions—mist lightly in morning to deter. Oncidiums prefer lots of light and fertilizer as new tissue develops.

Follow-Up: Shoot Identification

Chris provides a photo and asks if the shoot is a new pseudobulb or growth on the existing bulb. The expert confirms it's a new growth that will develop a pseudobulb at its base when mature—typically 4-8 weeks more growth, then a comparable period for the pseudobulb to harden off.