Re: Yellowing Trunk
We are familiar with the caliche (Ka-leech-ee) soil there in the Metroplex. It is quite ALKALINE, and I would suggest applications of copperas in the spring and fall, and a good topdressing with an acidifying mulch like pine.
Our friend in Arlington has that same soil that tested out at way too high pH for most of the plants she wants to grow.
You might try an application of iron (like Ironite) or a liquid soil acidifier and see if that does a quick fix for you.
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