Edema on Ming Aralia: Watering Practices to Prevent Bumps

Those Bumps Are Not Pests

The raised, wart-like bumps on the undersides of your Ming aralia leaves are edema (oedema)—a physiological response to fluctuating water pressure inside the leaf cells, often triggered by overwatering or watering on cloudy, cool days when transpiration is low.

Correct Watering Routine

• Water thoroughly until water flows freely from the drainage holes.
• Let the plant drain completely, then bring it back inside.
• Wait until the top inch of soil is dry and the plant shows slight wilting before watering again.
• Use a commercial insecticidal soap (e.g., Safer) if you spray—homemade mixes can burn leaves.

Outlook

Existing bumps won’t disappear, but new growth will be clean if you maintain the wet-dry cycle. Overwatering is the #1 killer of houseplants—roots need air as much as water.