Red Sunset Maple Top Leaf Drop: Root System Lag

Case

Two 2-yr-old Red Sunset maples (16 ft): lose leaves at top branch ends in summer. Top branches bare. Watered/fertilized properly. Need iron?

Diagnosis: Root-Foliage Imbalance

• Newly planted trees: roots can't support full canopy yet.
• Tree self-prunes (drops least-efficient leaves) to match root capacity.
• Common in first 2–3 years after planting large trees.

Iron? No.

Iron deficiency = interveinal yellowing on newest leaves. Your tree drops oldest leaves at tips. Not iron.

Correct Care

1. Mulch: 3" organic, to drip line, not touching trunk.
2. Deep Water: 1" per week (pan test: sprinkler until 1" in pan).
3. No Fertilizer: Let roots establish. Fertilize next year at ½ rate.
4. Planting Depth Check: Root flare at ground level.

Outlook

Tree will outgrow this as roots expand. Patience + consistent moisture = success.