Crepe Myrtle Spring Leaf Discoloration: Cold Injury vs. pH Issues

Why Crepe Myrtle Leaves Turn Reddish-Pink in Spring

In high-alkaline soil, crepe myrtle leaves may show reddish-pink, sickly coloration in spring. Two primary causes:

1. Cold Snap Injury

Sudden temperature drops after leaf emergence cause anthocyanin pigmentation (red/pink) as a stress response. Leaves usually green up as weather stabilizes.

2. Alkaline Soil (pH > 7.0)

Crepe myrtles prefer slightly acidic soil (pH 5.5–6.5). High pH limits iron and manganese uptake, causing chlorosis with reddish undertones.

Remediation

• Top-dress with pine needle compost to gradually lower pH.
• Apply chelated iron foliar spray for quick green-up.
• Ensure even moisture and good drainage.

Sooty mold (black leaves) is the only serious pest—treat aphids/scale if honeydew appears.