King Palm Transplant Shock in Full Sun: What's Normal

Newly Planted King Palms: Browning Fronds vs. Fatal Problems

Eight 6-ft King palms (Archontophoenix cunninghamiana) in full sun (Marin County, CA) with daily 15-min drip irrigation showing brown, sickly older fronds: classic transplant shock.

What's Happening

• Existing fronds grown in shade (nursery) burn in full sun
• Root system not yet established to support full transpiration
• New emerging fronds will be sun-adapted—watch these

Critical Planting Checks

1. Depth: Root flare visible, not buried
2. No mulch/stone against trunk (2 ft clearance)
3. Berm built to hold water on root ball
4. Native backfill only—no amended soil pocket

Watering Adjustment

Daily 15-min drip may be too frequent/shallow. Switch to:

• Deep soak 3×/week (30–45 min) to encourage deep roots
• Allow top 2–3" to dry between cycles
• Increase volume as roots expand

Monitoring

Spear leaf (center) is the only critical indicator. Green, firm, eventually opening = success. Browning lower fronds = expected. If new fronds emerge brown/distorted → problem (nutrient, water, depth).

Fertilizer

Wait 6–8 weeks. Then slow-release palm fertilizer with Mg, Mn, Fe.