San Antonio's caliche layer is dense, alkaline, and doesn't drain the way topsoil does elsewhere. When summer rain finally comes after a dry stretch, water tends to pool above that layer instead of moving down to the deeper root zone, which can leave roots sitting wet on top while staying dry underneath.
That uneven moisture is harder on a tree than a straightforward drought. Roots near the surface can suffocate in standing water while deeper roots go without, and the stress often doesn't show up as visible symptoms until weeks later, usually as yellowing leaves or thinning canopy.
Mulching out to the drip line and avoiding compacted soil near the base helps water move more evenly through caliche-heavy yards. It's a small adjustment that makes a real difference for how well a tree handles San Antonio's summer rain pattern.
Have you noticed standing water near any of your trees after a hard rain, even hours later? What part of your yard holds water the longest?
#SanAntonioTreeCare
A photo showing mulch applied properly around a tree's base and drip line, or a shot of San Antonio's caliche soil layer exposed during a job to illustrate the drainage issue. Real job photos from local properties are strongly preferred over stock imagery.
Canva text suggestion: "Caliche Soil Changes How Your Trees Drink" or "Uneven Drainage, Uneven Stress"