Troubleshooting
Giant Phragmipedium problems — and how to fix them
Giant Phragmipedium (Phragmipedium grande) 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.
Leaf-tip dieback
The most common and persistent symptom, caused by fluoride, hard water, or salt accumulation. Use only pure soft water and flush the medium at every watering.
Root death from water quality
Dissolved salts in tap water progressively damage roots until the plant collapses. Exclusive use of rainwater or RO water and annual repotting are mandatory.
Heat stress in summer
Temperatures above 22°C slow growth and can be fatal over extended periods. Position near an air conditioner or in a cool basement with supplemental lighting in summer.
Crown rot
Caused by warm temperatures with water sitting in the leaf fan. Keep cool and direct water to the roots, not the crown.
Scale and mealybug
Inspect regularly; treat with rubbing alcohol and horticultural oil spray. Systemic insecticide can be applied as a soil drench in severe infestations.
Prevent giant phragmipedium problems before they start
Most giant phragmipedium issues are care-mismatch, not bad luck. Dial in the basics:
Giant Phragmipedium problems — FAQ
Why is my giant phragmipedium leaf-tip dieback?
The most common and persistent symptom, caused by fluoride, hard water, or salt accumulation. Use only pure soft water and flush the medium at every watering.
Why is my giant phragmipedium root death from water quality?
Dissolved salts in tap water progressively damage roots until the plant collapses. Exclusive use of rainwater or RO water and annual repotting are mandatory.
Why is my giant phragmipedium heat stress in summer?
Temperatures above 22°C slow growth and can be fatal over extended periods. Position near an air conditioner or in a cool basement with supplemental lighting in summer.
Why is my giant phragmipedium crown rot?
Caused by warm temperatures with water sitting in the leaf fan. Keep cool and direct water to the roots, not the crown.
Why is my giant phragmipedium scale and mealybug?
Inspect regularly; treat with rubbing alcohol and horticultural oil spray. Systemic insecticide can be applied as a soil drench in severe infestations.