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Stumped by Tree Troubles? We're Here for You! - Get Your FREE Estimates!
By
Big Easy Tree Removal 
Aug 12, 2024 
0 Comments Iron deficiency in trees and shrubs causes yellowing leaves with green veins, a condition called chlorosis that is especially common in New Orleans, LA, where soil pH ranges from 7.0 to 7.8 due to historic oyster-shell fill. Treatment options include soil amendments with sulfur and iron sulfate, foliar sprays, and trunk injections for larger trees. Big Easy Tree Removal provides fertilization and nutrient treatment services to help restore healthy foliage across the Greater New Orleans area.
If the trees and shrubs on your New Orleans property are showing yellow leaves while the veins stay green, iron deficiency is the most likely cause. This condition, called iron chlorosis, is not a sign of neglect. It is a direct result of the alkaline soil conditions found throughout much of the Greater New Orleans metro area. At Big Easy Tree Removal, we see iron chlorosis regularly in neighborhoods from Uptown to Lakeview, and understanding why it happens here is the first step to fixing it.
New Orleans soil pH typically ranges from 7.0 to 7.8 on the south shore. That alkalinity traces back to the late 1800s, when oyster shells were used to fill in reclaimed swampland as the city expanded. Oyster shell is rich in calcium carbonate, which raises soil pH well above the slightly acidic 6.5 that most trees prefer. At these higher pH levels, iron binds tightly to soil particles and becomes unavailable for root absorption, even when plenty of iron is physically present in the ground.
The result is a nutrient lockout. Your trees have iron in the soil around them, but their roots cannot access it. This is why standard fertilizers that simply add more iron often fail in New Orleans. The problem is not a lack of iron; it is a pH problem that blocks uptake.
Compounding the issue, the city’s high humidity and heavy seasonal rainfall can waterlog soil, pushing oxygen out of the root zone. Saturated, compacted soils further reduce a tree’s ability to absorb iron and other micronutrients. Properties in low-lying areas of Mid-City, Gentilly, and New Orleans East are particularly vulnerable to these drainage-related nutrient problems.
Iron chlorosis produces a distinctive pattern on affected leaves: the tissue between the veins turns yellow or pale green while the veins themselves remain dark green. This interveinal yellowing typically appears on newer growth first, since iron is not easily moved within the plant from older leaves to younger ones. In advanced cases, leaves may turn almost white or develop brown, scorched edges.
The pattern is important for diagnosis. Nitrogen deficiency, by comparison, causes uniform yellowing across the entire leaf and usually affects older leaves first. Manganese deficiency looks similar to iron chlorosis but tends to show up as tan or gray patches between the veins rather than a clean yellow. If you are unsure, a leaf tissue analysis from a local lab can confirm which nutrient is lacking.
Watch closely during spring flush, when trees push out new growth rapidly. This is when iron demand peaks, and chlorosis symptoms often appear most dramatically. A tree that looked healthy all winter can show pronounced yellowing within weeks of leafing out.