Vanda Orchid Roots Turning Brown: Causes and Solutions for Florida Growers

Understanding Root Color Changes

If your Vanda orchids in Southwest Florida have lost their green root tips and turned brown, don't assume the worst immediately. Two common causes exist: temperature stress and natural dormancy cycles.

Temperature Stress in Outdoor Culture

Vandas grown outdoors may experience root tip dieback if nighttime temperatures drop too low. These tropical orchids prefer consistent warmth, and cool snaps can damage actively growing root tips.

Natural Dormancy Period

Vandas also have a natural rest period where roots go dormant—root tips turn white or brown and stop growing. This is normal. As humidity and warmth increase with the season, healthy roots should resume growth with fresh green tips.

When to Take Action

If no new root growth appears by June, consider a fungicide treatment. Submerge the plant in a fungicide solution at weekly intervals for several weeks to address potential root fungus issues that could be preventing regrowth.