The leaves on my orchid are wrinkled or pleated. Why?
If you own an orchid from the oncidium alliance (Miltonias, Brassias, Oncidiums, etc.) and the leaves are wrinkled (also called acordion pleating) you have a humidity problem. The air around the plant is not humid enough, or there is not enough water getting to the plant, either from underwatering or a root problem. Rotted roots cause the same symptoms as an underwatered plant as the roots are not carrying water to the plant.
While the plant may recover, the leaves will be permanently pleated.
Image by: Carol Tognacci
Pleated leaves on an oncid.