Diagnosing Brown Spots and Yellowing Leaves on Chitalpa in Alkaline Soil

Symptom Analysis

A newly planted chitalpa in New Mexico developed brown spots and chlorosis (yellowing leaves) within a month. The garden's highly alkaline soil is the likely culprit, as high pH locks up essential micronutrients like iron and calcium, making them unavailable to the plant.

Soil Amendment Strategies

To lower soil pH and restore nutrient availability, incorporate elemental sulfur or aluminum sulfate into the root zone. These amendments work gradually; for faster results, use water-soluble acidifiers such as Miracid. Always follow label rates and retest soil pH periodically.

Ongoing Care

Monitor new growth for improved color. Mulch with organic matter to buffer pH fluctuations and conserve moisture. Avoid over-fertilizing with high-nitrogen products, which can exacerbate chlorosis. A balanced, slow-release fertilizer formulated for acid-loving plants supports recovery.