Sticky Crystals on Aglaonema: Sap or Scale?

Salt-like crystals and stickiness on Aglaonema (Chinese evergreen) stems are usually harmless sap secretions—common on stems and leaf undersides. If the stickiness appears on top of leaves, it's likely honeydew from scale insects.

How to Tell the Difference

Sap: limited to stems and leaf undersides, wipes off, no pests visible.
Scale honeydew: on upper leaf surfaces, often with tiny brown bumps (scales) attached.

If scale is present, treat with alcohol-soap spray on all surfaces. If it's just sap, no action needed—the plant is healthy.