Troubleshooting
Large Cattleya problems — and how to fix them
Large Cattleya (Cattleya maxima) 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.
Flower spike blind (no spike despite healthy growth)
Without a well-defined summer dry-rest and temperature drop (5–8°C day-night differential in late summer), this species may fail to initiate flower spikes. Withhold water and reduce night temperatures by 5–8°C for 4–6 weeks once the new pseudobulb matures.
Bacterial soft rot on pseudobulbs
Wet, mushy, foul-smelling pseudobulbs indicate bacterial rot, typically Erwinia spp. Remove affected tissue with a sterile blade, dust with cinnamon or powdered sulphur as a natural fungicide, and keep drier. Increase air circulation permanently.
Root circling and die-back in small pots
Roots of this large species quickly fill a container, and if restricted for too long they begin to rot from compression. Repot into a container 5 cm larger than the current one when roots circle the inside walls or exit the drainage holes.
Prevent large cattleya problems before they start
Most large cattleya issues are care-mismatch, not bad luck. Dial in the basics:
Looking for large cattleya in general rather than its problems? Read the full large cattleya care guide — light, water, soil and feeding.
Large Cattleya problems — FAQ
Why is my large cattleya flower spike blind (no spike despite healthy growth)?
Without a well-defined summer dry-rest and temperature drop (5–8°C day-night differential in late summer), this species may fail to initiate flower spikes. Withhold water and reduce night temperatures by 5–8°C for 4–6 weeks once the new pseudobulb matures.
Why is my large cattleya bacterial soft rot on pseudobulbs?
Wet, mushy, foul-smelling pseudobulbs indicate bacterial rot, typically Erwinia spp. Remove affected tissue with a sterile blade, dust with cinnamon or powdered sulphur as a natural fungicide, and keep drier. Increase air circulation permanently.
Why is my large cattleya root circling and die-back in small pots?
Roots of this large species quickly fill a container, and if restricted for too long they begin to rot from compression. Repot into a container 5 cm larger than the current one when roots circle the inside walls or exit the drainage holes.