Sycamore Leaf Drop in Extreme Drought: Watering Strategy

Diagnosis: Drought Stress Response

Sycamores naturally shed older leaves yellow/brown without wilting when water-stressed—a survival mechanism. Your watering (1 hour 2×/week) likely wets only the surface; grass competes heavily for moisture.

Correct Watering Protocol

• Measure, don't time: Place pan under sprinkler; run until 1 inch collects.
• Frequency: Every 3 days for a month, then weekly (unless 1"+ rain).
• Target zone: Water at and beyond dripline—not at trunk. Feeder roots are far out.
• Check soil: Probe 4–6" deep; should be moist.

Critical: Stop Fertilizing

• Fertilizer (especially 29-0-10) burns drought-stressed roots.
• NO weed-and-feed—herbicide component kills trees.
• Resume fertilizing only after full recovery and normal rainfall returns.

Root Zone Reality

In shallow/compacted soil, roots are wider and shallower. Water a broad area, not just near trunk.