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Yellow Leaves With Green Veins

Leaves going yellow while the veins stay green usually means the tree can't get at the iron that is already in the soil. Around here that is a soil problem more than a tree problem.

What It Can Be

Iron Chlorosis, Most of the Time

Blackland clay runs alkaline. In alkaline soil, iron locks up into a form the roots can't take in, so the tree runs short on it even though there is plenty in the ground. The leaf turns yellow between the veins first because that is where the iron runs out first.

It shows up most on trees that would rather be growing somewhere with more acidic soil. Pin oak, sweetgum, silver maple, river birch and some of the red maples are ones we see it on regularly in this part of Texas. It can hit others in a wet spring or on compacted ground.

Why It Matters

Slow, but It Adds Up

A mildly chlorotic tree can live a long time. A badly chlorotic one has trouble feeding itself, and over a few seasons that usually shows as thinning, scorched leaf edges, and dieback in the top of the tree. The tree is also weaker when heat, drought or insects come along.

Yellow leaves with the veins still green, usually starting at the tips of the branches
Worse on the newest growth
Leaf edges browning later in the season
A species that is known for it, planted in clay

Read more from people who study thisTexas A&M AgriLife on iron deficiency in alkaline soil

What You Can Check

Confirm the Pattern Before Spending Anything

Look at the veins. Green veins with yellow between them is the tell. A leaf that is yellow all over is usually something else.
Check the root flare and the mulch. A buried flare or a thick mulch volcano can produce the same symptoms, and that fix is free.
Skip the generic fertilizer. Adding nitrogen to a chlorotic tree usually makes it grow faster without fixing the iron, which can make the yellowing worse.

What Arborwise Checks

Species, Soil, and Whether It Is Worth Treating

We would confirm the species first, because on some trees this is a site problem that never really goes away, and that changes what is worth spending money on.

Whether the species is one that struggles in alkaline soil
The root flare, soil compaction, and drainage around the base
Whether a treatment is likely to hold, or just buy a season
Whether the better long-term answer is a different tree in that spot

There are treatments that can help, from soil amendments to iron applied directly to the tree. Some work for a year or two, some longer. We would rather tell you which is which than sell you one.

“Send a close photo of a few leaves with the light behind them so the veins show, and one of the whole tree. We can usually tell from that.”Annie, the Arborwise™ owl

Try The Checker

Not Sure This Matches Your Tree?

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