Hi guys! Lately, I've noticed alot of people having trouble with their masdevallias. I love Masdevallias ( I have 8 ) they grow/bloom great for me. Below I'm going to list some situations with solutions that have worked for me in the past.
1. Sudden loss of green healthy leaves. Caused by stress. Usually this happens quickly, so you have a small window of opportunity to react. First, stop watering, keep temp/light low. If Leaves continue to fall, take the plant out of medium, and into glass with a little water. No Sphag n' bag method, it'll rot.
2. Leaves rot at the base. This usually happens when plant is potted to deep in medium. Stop watering and pull plant half way out of medium.
3. Plant isn't doing anthing. Transfer into smaller pot.
Seasonal Care: Don't exspect masdevallias to thrive during warm months. I let mine go almost dormant. I water less and put them in shade.
Potting: I think underpotting in clay pots, with 100% sphag moss is best. Allow medium to dry out between each watering.
Temp/light: Unless plant variety is especially sensitive to high temp, room temp is fine. But when temp goes over 80 degrees F. Stop watering and put in shade. Moisture + heat = rot.
If anyone else has some tips PLEASE SHARE!
Hope this is helpful. Good Luck!