White Pits on Jade Plant (Senecio jacobsenii): Heat Stress, Not Pests

White pits on Senecio jacobsenii leaves

Close-up showing pit detail — not raised bumps

Reader Question

My 2-month-old Senecio jacobsenii (trailing jade) in Los Angeles has developed small white pits in some leaves. They're pits, not bumps. Could it be scale? The plant gets direct sun by a window, watered every 3 weeks. Is humidity too high?

Diagnosis: Heat Stress + Underwatering

Not pests or disease. The pits are caused by high temperatures combined with insufficient water. Senecio likes direct sun but not extreme heat. In LA's recent heat, watering every 3 weeks is too infrequent — especially in direct sun.

Key Facts

• Pits are cosmetic — existing ones won't disappear.
• Humidity is not the issue.
• No treatment needed — just prevent new pits.

Adjusted Care

1. Water when top ½ inch of soil is dry — likely every 10–14 days in heat.
2. Provide some afternoon shade if temps exceed 85°F.
3. Ensure pot has drainage; never let sit in water.

Monitor new growth — it should be pit-free with proper hydration.

Free Senecio care guide: wcreed@HorticulturalHelp.com.