Troubleshooting
Large Chain Orchid problems — and how to fix them
Large Chain Orchid (Dendrochilum magnum) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Scale insects
Scale colonises the pseudobulbs and leaf undersides of Dendrochilum readily. Inspect regularly and treat with alcohol swabs plus a systemic insecticide if infestations are heavy.
Root rot
Caused by a decomposing, waterlogged medium. Repot every two years and ensure excellent drainage. Inspect roots at repotting and trim any blackened or mushy sections.
Failure to flower
Requires a distinct cooler, slightly drier rest in winter (10-14°C nights) to initiate the long, pendant flower chains. Without this cue, the plant produces vegetative growth only.
Pseudobulb shrivelling
Indicates water deficit or root damage. Inspect roots first; if healthy, increase watering frequency. Shrivelled back-bulbs in established clumps are normal as they age.
Prevent large chain orchid problems before they start
Most large chain orchid issues are care-mismatch, not bad luck. Dial in the basics:
Large Chain Orchid problems — FAQ
Why is my large chain orchid scale insects?
Scale colonises the pseudobulbs and leaf undersides of Dendrochilum readily. Inspect regularly and treat with alcohol swabs plus a systemic insecticide if infestations are heavy.
Why is my large chain orchid root rot?
Caused by a decomposing, waterlogged medium. Repot every two years and ensure excellent drainage. Inspect roots at repotting and trim any blackened or mushy sections.
Why is my large chain orchid failure to flower?
Requires a distinct cooler, slightly drier rest in winter (10-14°C nights) to initiate the long, pendant flower chains. Without this cue, the plant produces vegetative growth only.
Why is my large chain orchid pseudobulb shrivelling?
Indicates water deficit or root damage. Inspect roots first; if healthy, increase watering frequency. Shrivelled back-bulbs in established clumps are normal as they age.