Soil pH in Lavaca, TX: Lime or Sulfur?

Typical topsoil pH in Lavaca, TX

Typical topsoil in Lavaca, TX is pH 6.71, already right for vegetable garden (6-7). Test before adding anything.

What Lavaca needs, by plant

• Already in range: lawn (cool-season grass), vegetable garden, tomatoes, roses.
• Just outside, test first: strawberries (off by 0.2), pink hydrangeas (off by 0.2).
• Beds or pots instead: potatoes, blueberries, azaleas and rhododendrons, blue hydrangeas.

What to do next

If your test lands near 6.71, you can skip lime and sulfur for lawn (cool-season grass), vegetable garden, tomatoes, strawberries, roses, pink hydrangeas.

How mixed the soil is

Of the 521,358 surveyed acres in Lavaca, TX, 36% are moderately acidic (5.5-6.5), 33% are alkaline (above 7.3), 21% are near neutral (6.5-7.3), 10% are strongly acidic (below 5.5). Mapped soils run from pH 5 to 8.2, a spread of 3.2 units across 45 soil components. No single class covers 60% of the county, so two gardens a few miles apart here can need opposite treatments. Test your own bed.

Clay, organic matter and rates

Topsoil here averages 19.8% clay and 1.59% organic matter, which this site treats as loam. Moving it one pH unit takes about 7 lb of lime or 2.3 lb of sulfur per 100 sq ft. 38% of mapped components carry free carbonate (lime already in the ground), enough that sulfur gets neutralised before it does much.

Lavaca against the rest of Texas

pH 6.71 is 0.72 below the Texas median of 7.43. 61 of 254 Texas counties have more acidic topsoil. Nationally it is more alkaline than the US county median of 6.05.

Closest in pH within the state: Lamar (6.68), Llano (6.68), Gonzales (6.7), Fort Bend (6.71), Limestone (6.73), Wheeler (6.75), Clay (6.76), Kaufman (6.76).

The range in Texas runs from Hardin at 4.64 to Upton at 8.19; Lavaca sits 58% of the way up.