Sago Palm Yellowing Leaves: Diagnosing the Cause

Question

Sago leaf Hi Will, bought a sago palm a couple months ago. Leaves yellowing from inside. Checked for abnormalities—none found. Water lightly once weekly. No insects seen, haven't checked roots. Nutrition deficiency? Only 4 fronds—should I fertilize at this stage? If so, what fertilizer?

Sitaram

Answer

Hi Sitaram, several possible causes for yellowing:

1. Spider mites: Mist plant with fine spray—fine webs between needles catching droplets indicate mites. Treat by thoroughly spraying all leaf surfaces with soapy water.
2. Inadequate light: Sago palms must be on a moderately sunny windowsill. Low light causes yellowing and gradual death.
3. Oversized pot: Pot looks large for plant size. Excess soil stays wet too long, causing root rot.
4. Hard water: If local water is hard, it affects soil pH, making nutrients unavailable. Use filtered/distilled water to flush soil several times, then continue with filtered/distilled water. Once pH corrects, nutrients become available—no fertilizer needed.

I've written articles on plant pests and fertilizers I'll email free to anyone requesting at wcreed@HorticulturalHelp.com.

Will Creed, Interior Landscaper
Horticultural Help, NYC