Systemic Granules on orchid
What's Happening
The primary issue is not the yellowing spikes (normal post-bloom senescence in orchids like Phalaenopsis), but an unsuitable potting medium causing poor root aeration and health, compounded by insufficient leaves for photosynthesis, leading to overall plant stress and risk of root rot.
How to Fix It
- 1
Cut yellow spike back to 1 inch above healthy tissue to prevent wet wounds.
- 2
Cut second spike just below blooms and above the top node to redirect energy.
- 3
Remove plant from pot, discard seedling plug if present, soak and clean roots, trim mushy or papery roots with sterile snips.
- 4
Repot in clear, ventilated plastic pot (snug fit to healthy roots) using pure pine orchid bark or bark+moss in hot/arid conditions.
- 5
Flush pot with water to remove bark dust, then water only when bark is fully dry and roots appear silver.
How to Prevent It
Use orchid-specific bark medium from the start for optimal aeration; monitor root color (silver = dry) and medium dryness; provide bright indirect light (1500-2500 fc) to promote leaf growth; maintain 50-70% humidity without overwatering in low-ventilation spaces.